Hearth and Home Technologies CERONA-42 User Manual

Model(s):

CERONA-36
CERONA-42

Owner’s Manual

Installation and Operation

CAUTION

DO NOT DISCARD THIS MANUAL

• Important operating
and maintenance
instructions included.

WARNING: If the information in these
instructions is not followed exactly, a fi re
or explosion may result causing property
damage, personal injury, or death.

• Do not store or use gasoline or other fl am-
mable vapors and liquids in the vicinity of
this or any other appliance.

• What to do if you smell gas

- Do not try to light any appliance

- Do not touch any electrical switch. Do not

use any phone in your building.

- Immediately call your gas supplier from a

neighbor’s phone. Follow the gas suppli­er’s instructions.

- If you cannot reach your gas supplier, call

the fi re department.

• Installation and service must be performed
by a qualifi ed installer, service agency , or the
gas supplier.

This appliance may be installed as an OEM installation in
manufactured home (USA only) or mobile home and must be
installed in accordance with the manufacturer’s instructions and
the manufactured home construction and safety standard, Title

24 CFR, Part 3280 or Standard for Installation in Mobile Homes,
CAN/CSA Z240MH.

This appliance is only for use with the type(s) of gas indicated
on the rating plate.

• Read, understand and follow
these instructions for safe
installation and operation.

DO NOT

DISCARD

• Leave this manual with
party responsible for use
and operation.

WARNING

HOT SURFACES!

Glass and other surfaces are hot during
operation AND cool down.

Hot glass will cause burns.

• DO NOT touch glass until it is cooled

• NEVER allow children to touch glass

• Keep children away

• CAREFULLY SUPERVISE children in same room as
fi replace.

• Alert children and adults to hazards of high temperatures.

High temperatures may ignite clothing or other fl ammable
materials.

• Keep clothing, furniture, draperies and other fl ammable
materials away.

This appliance has been supplied with an integral barrier
to prevent direct contact with the fi xed glass panel. DO
NOT operate the appliance with the barrier removed.

Contact your dealer or Hearth & Home Technologies if the
barrier is not present or help is needed to properly install one.

In the Commonwealth of Massachusetts:

• installation must be performed by a licensed plumber
or gas fi tter;

See Table of Contents for location of additional
Commonwealth of Massachusetts requirements.

Installation and service of this appliance should be
performed by qualifi ed personnel. Hearth & Home
Technologies suggests NFI certifi ed or factory trained
professionals, or technicians supervised by an NFI
certifi ed professional.

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/08 1

Read this manual before installing or operating this appliance.

Please retain this owner’s manual for future reference.

Congratulations

Congratulations on selecting a Heat & Glo gas appliance
—an elegant and clean alternative to wood burning
appliances. The Heat & Glo gas appliance you have
selected is designed to provide the utmost in safety,
reliability, and effi ciency.

As the owner of a new appliance, you’ll want to read and
carefully follow all of the instructions contained in this
Owner’s Manual. Pay special attention to all Cautions and
Warnings.

Homeowner Reference Information

This Owner’s Manual should be retained for future
reference. We suggest that you keep it with your other
important documents and product manuals.

The information contained in this Owner’s Manual, unless
noted otherwise, applies to all models and gas control
systems.

Your new Heat & Glo gas appliance will give you years of
durable use and trouble-free enjoyment. Welcome to the
Heat & Glo family of appliance products!

We recommend that you record the following pertinent
information about your appliance.

Model Name: ___________________________________________ Date purchased/installed: __________________
Serial Number: __________________________________________ Location on appliance: ____________________
Dealership purchased from: _______________________________ Dealer Phone: __________________________
Notes: _______________________________________________________________________________________
_____________________________________________________________________________________________

Listing Label Information/Location

This product may be coveredby one or more ofthe following patents: (Nos produitssont couverts par un ouplusieurs des brevets suivants): (United States)
4593510,4686807, 4766876, 4793322, 4811534, 5000162, 5016609, 5076254, 5113843, 5191877, 5218953, 5263471, 5328356,5341794, 5347983, 5429495,
5452708,5542407, 5601073, 5613487, 5647340, 5688568, 5762062, 5775408, 5890485,5931661, 5941237, 594711 2,5996575, 6006743,6019099, 6048195,
6053165, 6145502, 6170481, 6237588, 6296474, 6374822, 6413079, 6439226, 6484712, 6543698, 6550687, 6601579, 6672860, 6688302B2, 6715724B2,
6729551, 6736133, 6748940, 6748942, D320652,D445174, D462436; (Canada)1297749, 2195264, 2225408;or other U.S. and foreignpatents pending (ou
autresbrevetsamericainsetetrangersenattente).

Type of Gas

Not for use with solid fuel .
(Ne doit pas entre utilise avec un combustible solide).

Ty pe of Gas (Sorte De Gaz) :

NATURA L GAS

Gas and Electric
Information

Minimum Permissible Gas Supply for Purpos es of Input Adjustment .
Approved Minimum (De Gaz) Acceptabl e 0. 0 in w. c. (Po. Col. d’eau)
Maximum Pressure (Pression) 0. 0 in w. c. (Po. Col. d’eau)
Maximum Manifold Pressure (Pression) 0. 0 in w. c. (Po. Col. d’eau)
Minimum Manifold Pressure (Pression) 0. 0 in w. c. (Po. Col. d’eau)
T o tal Electrical Requirements: 000V ac, 00Hz., less than 00 Ampere s

AL TI TUDE : 0-0000 FT . 0000-0000FT .
MAX. INPU T BTUH: 00,000 00,000
MIN. INPU T BTUH: 00,000 00,000
ORIFICE SIZE: #XXXXX #XXXXX

The model information regarding your specifi c appliance can be found on
the rating plate usually located in the control area of the appliance.

He at & Gl o, a of Hearth & Ho me Te chnologies, Inc.
20802 Kensington Boulevard, Lakeville, MN 5504 4

This appliance must be installed in accordance with local codes, if any; if not, follow ANSI Z223.1
in the USA or CAN/CG A B149 installation codes. (Installer l’ appa re il selon les codes ou regl emen ts

lo caux ou , en l’absence de tels reglements, selon les codes d’in stallation CAN/CGA-B149.)

bran d

ANSI Z21X X-XXXX · CS A 2.XX-MXX · UL307B

IN CANADA

Mode l:

(Modele):

Serial

(Serie):

XXXXXXXX

XXXXXXXX

MADE IN US A

Model Number

Serial Number

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/082

Table of Contents

1 Listing and Code Approvals

A. Appliance Certifi cation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

B. BTU Specifi cations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

C. High Altitude Installations . . . . . . . . . . . . . . . . . . . . . . . . . . 4

D. Non-Combustible Materials Specifi cation. . . . . . . . . . . . . . 4

E. Combustible Materials Specifi cation . . . . . . . . . . . . . . . . . 4

F. Electrical Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

G. Requirements for the Commonwealth of Massachusetts . . 5

2 Getting Started

A. Design and Installation Considerations . . . . . . . . . . . . . . . 6

B. Tools and Supplies Needed . . . . . . . . . . . . . . . . . . . . . . . . 6

C. Inspect Appliance and Components . . . . . . . . . . . . . . . . . . 6

D. Inspect Firebox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 Framing and Clearances

A. Selecting Appliance Location . . . . . . . . . . . . . . . . . . . . . . . 8

B. Constructing the Appliance Chase . . . . . . . . . . . . . . . . . . . 9

C. Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

D. Mantel Projections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

E. Hearth Extension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

4 Termination Locations

A. Vent Termination Minimum Clearances . . . . . . . . . . . . . . 12

B. Continue Adding Vent Components . . . . . . . . . . . . . . . . . 14

C. Install Support Brackets . . . . . . . . . . . . . . . . . . . . . . . . . . 14

9 Gas Information

A. Fuel Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

B. Gas Pressures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

C. Gas Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

10 Electrical Information

A. Recommendation for Wire . . . . . . . . . . . . . . . . . . . . . . . . 32

B. Connecting to the Appliance. . . . . . . . . . . . . . . . . . . . . . . 32

C. Intellifi re Ignition System Wiring . . . . . . . . . . . . . . . . . . . . 32

D. Junction Box Installation. . . . . . . . . . . . . . . . . . . . . . . . . . 33

11 Finishing

A. Mantel Projections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

B. Facing Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

C. Finishing Material Options . . . . . . . . . . . . . . . . . . . . . . . . 37

D. Hearth Extension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

12 Appliance Setup

A. Remove Shipping Materials . . . . . . . . . . . . . . . . . . . . . . . 39

B. Clean the Appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

C. Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

D. Ember Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

E. Positioning the Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

F. Glass Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

G. Grilles and Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

H. Air Shutter Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

5 Vent Information and Diagrams

A. Vent Table Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

B. Use of Elbows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

C. Measuring Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

D. Vent Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6 Vent Clearances and Framing

A. Pipe Clearances to Combustibles . . . . . . . . . . . . . . . . . . 19

B. Wall Penetration Framing . . . . . . . . . . . . . . . . . . . . . . . . . 19

C. Vertical Penetration Framing . . . . . . . . . . . . . . . . . . . . . . 20

7 Appliance Preparation

A. Removing Non-combustible Facing Material Assembly . . 21

B. Securing and Leveling the Appliance . . . . . . . . . . . . . . . . 22

C. Installing Non-combustible Facing Material . . . . . . . . . . . 22

D. Installing Flue Restrictors . . . . . . . . . . . . . . . . . . . . . . . . . 23

8 Installing Vent Pipe

A. Assembly of Vent Sections . . . . . . . . . . . . . . . . . . . . . . . . 24

B. Securing the Vent Sections . . . . . . . . . . . . . . . . . . . . . . . 26

C. Disassembly of Vent Sections . . . . . . . . . . . . . . . . . . . . . 26

D. Installing Heat Shield and Horizontal Termination Cap . . 27
E. Installing Roof Flashing and Vertical Termination Cap . . . 28

13 Operating Instructions

A. Before Lighting Appliance. . . . . . . . . . . . . . . . . . . . . . . . . 45

B. Lighting Appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

C. After Appliance is Lit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

D. Frequently Asked Questions . . . . . . . . . . . . . . . . . . . . . . 47

14 Troubleshooting

A. Intellifi re Ignition System . . . . . . . . . . . . . . . . . . . . . . . . . 48

15 Maintaining and Servicing Appliance

A. Maintenance Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

16 Reference Materials

A. Appliance Dimension Diagram . . . . . . . . . . . . . . . . . . . . . 52

B. Vent Components Diagrams . . . . . . . . . . . . . . . . . . . . . . 53

C. Service Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

D. Limited Lifetime Warranty . . . . . . . . . . . . . . . . . . . . . . . . . 63

E. Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

 = Contains updated information.

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/08 3

1

1

Listing and Code Approvals

A. Appliance Certifi cation

MODELS: CERONA-36, CERONA-42
LABORATORY: Underwriters Laboratories, Inc. (UL)
TYPE: Direct Vent Gas Appliance Heater
STANDARD: ANSI Z21.88b-2005 • CSA2.33b-M2005 • UL307B

This product is listed to ANSI standards for “Vented Gas
Appliance Heaters” and applicable sections of “Gas Burn­ing Heating Appliances for Manufactured Homes and
Recreational Vehicles”, and “Gas Fired Appliances for
Use at High Altitudes”.

NOT INTENDED FOR USE AS A PRIMAR Y HEAT SOURCE.

This appliance is tested and approved as either supplemen­tal room heat or as a decorative appliance. It should not be
factored as primary heat in residential heating calculations.

Note: This installation must conform with local codes. In the
absence of local c odes you must comply w ith the National
Fuel Gas Code, ANSI Z223.1 -latest edition in the U.S.A. and
the CAN/CGA B149 Installation Codes in Canada.

C. High Altitude Installations

U.L. Listed gas appliances are tested and approved with­out requiring changes for elevations from 0 to 2000 feet in
the U.S.A. and Canada.

When installing this appliance at an elevation above 2000
feet, it may be necessary to decrease the input rating
by changing the existing burner orifi ce to a smaller size.
Input rate should be reduced by 4% for each 1000 feet
above a 2000 foot elevation in the U.S.A., or 10% for el­evations between 2000 and 4500 feet in Canada. If the
heating value of the gas has been reduced, these rules
do not apply . To identify the proper orifi ce size, check with
the local gas utility.

If installing this appliance at an elevation above 4500 feet
(in Canada), check with local authorities.

WARNING

Do NOT use this appliance if any part has been under water.
Immediately call a qualifi ed service technician to inspect the
appliance and to replace any part of the control system and
any gas control which has been under water.

This model may be installed in a bedroom or bed-sitting
room in the U.S.A. and Canada.

B. BTU Specifi cations

Model

(U.S. or Canada)

Cerona-36 (NG)

Cerona-42 (NG)

US

(0-2000 FT)

CAN

(2000-4500 FT)

US

(0-2000 FT)

CAN

(2000-4500 FT)

Maximum

Input BTU/h

37,500 25,000 32
33,750 22,300 33
48,000 32,000 29
40,500 28,800 30

Minimum

Input BTU/h

Orifi ce

Size

(DMS)

D. Non-Combustible Materials Specifi cation

Material which will not ignite and burn. Such materials are
those consisting entirely of steel, iron, brick, tile, concrete,
slate, glass or plasters, or any combination thereof.

Materials that are reported as passing ASTM E 136,

Standard Test Method for Behavior of Materials in a
Vertical Tube Furnace at 750ºC, shall be considered

non-combustible materials.

E. Combustible Materials Specifi cation

Materials made of or surfaced with wood, compressed
paper, plant fi bers, plastics, or other material that can ig-
nite and burn, whether fl ame proofed or not, or whether
plastered or unplastered shall be considered combustible
materials.

F. Electrical Codes

NOTICE: This appliance must be electrically wired and
grounded in accordance with local codes or, in the absence
of local codes, with National Electric Code ANSI/NFPA

70-latest edition or the Canadian Electric Code CSA
C22.1.

• A 110-120 VAC circuit for this product must be protected

with ground-fault circuit-interrupter protection, in compliance
with the applicable electrical codes, when it is installed in
locations such as in bathrooms or near sinks.

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/084

Note: The following requirements reference various
Massachuset ts and national codes not contained in this
document.

G. Requirements for the Commonwealth of

Massachusetts

For all side wall horizontally vented gas fueled equipment
installed in every dwelling, building or structure used in
whole or in part for residential purposes, including those
owned or operated by the Commonwealth and where the
side wall exhaust vent termination is less than seven (7)
feet above fi nished grade in the area of the venting, in-
cluding but not limited to decks and porches, the following
requirements shall be satisfi ed:

Installation of Carbon Monoxide Detectors

At the time of installation of the side wall horizontal vented
gas fueled equipment, the installing plumber or gas fi tter
shall observe that a hard wired carbon monoxide detector
with an alarm and battery back-up is installed on the fl oor
level where the gas equipment is to be installed. In addi­tion, the installing plumber or gas fi tter shall observe that
a battery operated or hard wired carbon monoxide detec­tor with an alarm is installed on each additional level of
the dwelling, building or structure served by the side wall
horizontal vented gas fueled equipment. It shall be the
responsibility of the property owner to secure the services
of qualifi ed licensed professionals for the installation of
hard wired carbon monoxide detectors.

In the event that the side wall horizontally vented gas fu­eled equipment is installed in a crawl space or an attic,
the hard wired carbon monoxide detector with alarm and
battery back-up may be installed on the next adjacent
fl oor level.
In the event that the requirements of this subdivision can
not be met at the time of completion of installation, the
owner shall have a period of thirty (30) days to comply
with the above requirements; provided, however, that dur­ing said thirty (30) day period, a battery operated carbon
monoxide detector with an alarm shall be installed.

Inspection

The state or local gas inspector of the side wall horizon­tally vented gas fueled equipment shall not approve the
installation unless, upon inspection, the inspector ob­serves carbon monoxide detectors and signage installed
in accordance with the provisions of 248 CMR 5.08(2)(a)1
through 4.

Exemptions

The following equipment is exempt from 248 CMR

5.08(2)(a)1 through 4:

• The equipment listed in Chapter 10 entitled “Equip-

ment Not Required To Be Vented” in the most current
edition of NFPA 54 as adopted by the Board; and

• Product Approved side wall horizontally vented gas fu-

eled equipment installed in a room or structure sep­arate from the dwelling, building or structure used in
whole or in part for residential purposes.

MANUFACTURER REQUIREMENTS
Gas Equipment Venting System Provided

When the manufacturer of Product Approved side wall
horizontally vented gas equipment provides a venting
system design or venting system components with the
equipment, the instructions provided by the manufacturer
for installation of the equipment and the venting system
shall include:

• Detailed instructions for the installation of the venting

system design or the venting system components; and

• A complete parts list for the venting system design or

venting system.

Gas Equipment Venting System NOT Provided

When the manufacturer of a Product Approved side wall
horizontally vented gas fueled equipment does not pro­vide the parts for venting the fl ue gases, but identifi es
“special venting systems”, the following requirements
shall be satisfi ed by the manufacturer:

Approved Carbon Monoxide Detectors

Each carbon monoxide detector as required in accor­dance with the above provisions shall comply with NFPA
720 and be ANSI/UL 2034 listed and IAS certifi ed.

Signage

A metal or plastic identifi cation plate shall be permanent-
ly mounted to the exterior of the building at a minimum
height of eight (8) feet above grade directly in line with the
exhaust vent terminal for the horizontally vented gas fu­eled heating appliance or equipment. The sign shall read,
in print size no less than one-half (1/2) inch in size, “GAS

VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OB­STRUCTIONS”.

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/08 5

• The referenced “special venting system” instructions

shall be included with the appliance or equipment in­stallation instructions; and

• The “special venting systems” shall be Product Ap-

proved by the Board, and the instructions for that sys­tem shall include a parts list and detailed installation
instructions.

A copy of all installation instructions for all Product Ap­proved side wall horizontally vented gas fueled equip­ment, all venting instructions, all parts lists for venting
instructions, and/or all venting design instructions shall
remain with the appliance or equipment at the completion
of the installation.

See Gas Connection section for additional Common­wealth of Massachusetts requirements.

2

2

Getting Started

A. Design and Installation Considerations

Heat & Glo direct vent gas appliances are designed to
operate with all combustion air siphoned from outside of
the building and all exhaust gases expelled to the out­side. No additional outside air source is required.

CAUTION

Check building codes prior to installation.

• Installation MUST comply with local, regional, state and
national codes and regulations.

• Consult local building, fi re offi cials or authorities having jurisdic-
tion about restrictions, installation inspection, and permits.

When planning an appliance installation, it’s necessary to
determine the following information before installing:

• Where the appliance is to be installed.

• The vent system confi guration to be used.

• Gas supply piping.

• Electrical wiring.

• Framing and fi nishing details.

• Whether optional accessories—devices such as a fan,
wall switch, or remote control—are desired.

C. Inspect Appliance and Components

WARNING

Inspect appliance and components for damage.
Damaged parts may impair safe operation.

• Do NOT install damaged components.

• Do NOT install incomplete components.

• Do NOT install substitute components.
Report damaged parts to dealer.

• Carefully remove the appliance and components from
the packaging.

• The vent system components and trim doors are shipped
in separate packages.

• The gas logs may be packaged separately and must be
fi eld installed.

• Report to your dealer any parts damaged in shipment,
particularly the condition of the glass.

• Read all of the instructions before starting the insta­llation. Follow these instructions carefully during the
installation to ensure maximum safety and benefi t.

WARNING

WARNING

Keep appliance dry.

• Mold or rust may cause odors.

• Water may damage controls.

B. Tools and Supplies Needed

Before beginning the installation be sure that the following
tools and building supplies are available.

Reciprocating saw Framing material
Pliers Hi temp caulking material
Hammer Gloves
Phillips screwdriver Framing square
Flat blade screwdriver Electric drill and bits (1/4 in.)
Plumb line Safety glasses
Level 1/2 - 3/4 inch length, #6 or #8 Self-drilling screws
Manometer Voltmeter
Tape measure Noncorrosive leak check solution
One 1/4 inch female connection (for optional fan).

• Installation and use of any damaged appliance or vent
system component.

• Modifi cation of the appliance or vent system.

• Installation other than as instructed by Hearth & Home
Technologies.

• Improper positioning of the gas logs or the glass door.

• Installation and/or use of any component part not approved
by Hearth & Home Technologies.

Any such action may cause a fi re hazard.

Hearth & Home Technologies disclaims any
responsibility for, and the warranty will be voided
by, the following actions:

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/086



D. Inspect Firebox

Surface cracking or crazing of fi rebrick material is normal
and expected. The following types of cracks are acceptable
and do not require replacement of the unit or the fi rebox:

• Cracks that do not propagate entirely thru the material.

• Light fracture lines or “spider-webbing” on the surface of

the material.

• Cracks that are less than 1/32 in. wide and less than 3

in. long.

• If cosmetically unacceptable, such cracks may be

repaired with the SRV-PACK service kit. See Service
Parts List.

Cracks that are unacceptable:

• Cracks greater than 1/32 in. wide and 3 in. long are at

risk of growing.

• Cracks that penetrate entirely through the firebrick

material.

Inspection for cracking should be run when the appliance
is cool. Cracks tend to close as the appliance heats up.

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/08 7

3

3

Framing and Clearances

Note:

• Illustrations reflect typical installations and are FOR

DESIGN PURPOSES ONLY.

• Illustrations/diagrams are not drawn to scale.

• Actual installation may vary due to individual design

preference.

A. Selecting Appliance Location

When selecting a location for your appliance it is important to
consider the required clearances to walls (see fi gure 3.1).

A

H

A

F

B

Note: For actual appliance dimensions refer to Sec­tion 16.

ALCOVE

INSTALLATION

WARNING

Fire Risk
Provide adequate clearance:

• Around air openings

• To combustibles

• For service access
Locate appliance away from traffi c areas.

D

C

In addition to these framing dimensions, also reference the following sections:

• Clearances and Mantel Projections (Sections 3.C and 3.D)

• Vent Clearances and Framing (Section 6).

G

CERONA-36 A B C D E F G H

Inches 51 42-1/8 73-1/4 36 65-1/2 1/2 22-1/4 16

Millimeters 1295 1070 1861 914 1664 13 565 406

CERONA-42 A B C D E F G H

Inches 56-5/8 49-1/8 80-1/8 36 72-1/2 1/2 22-1/4 18-3/4

Millimeters 1438 1248 2035 914 1842 13 565 476

E

B

Figure 3.1 Appliance Locations

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/088

B. Constructing the Appliance Chase

A chase is a vertical boxlike structure built to enclose the
gas appliance and/or its vent system. Vertical vents that
run on the outside of a building may be, but are not re­quired to be, installed inside a chase.

Construction of the chase may vary with the type of build­ing. These instructions are not substitutes for the require­ments of local building codes. Local building codes MUST
be checked.

Chases should be constructed in the manner of all out­side walls of the home to prevent cold air drafting prob­lems. The chase should not break the outside building
envelope in any manner.

Walls, ceiling, base plate and cantilever fl oor of the chase
should be insulated. Vapor and air infi ltration barriers
should be installed in the chase as per regional codes for
the rest of the home. Additionally, in regions where cold
air infi ltration may be an issue, the inside surfaces may be
sheetrocked and taped for maximum air tightness.

To further prevent drafts, the wall shield and ceiling
fi restops should be caulked with high temperature caulk
to seal gaps. Gas line holes and other openings should
be caulked with high temp caulk or stuffed with unfaced

insulation. If the appliance is being installed on a cement
slab, a layer of plywood may be placed underneath to pre­vent conducting cold up into the room.

C. Clearances

WARNING

Fire Risk.
Odor Risk.

• Install appliance on hard metal or wood surfaces
extending full width and depth of appliance.

• Do NOT install appliance directly on carpeting,
vinyl, tile or any combustible material other than
wood.

WARNING

Fire Risk.

• Construct chase to all clearance specifi cations
in manual.

• Locate and install appliance to all clearance
specifi cations in manual.

B

Cerona-36

Cerona-42

(Vent Pipe)

in

mm

in

mm

A

E

F

C

G

D

J

I

H

CLEARANCES TO COMBUSTIBLES:

A BCD E F G H I J

Rough

Opening

Rough

Opening

(Height)

Rough

Opening

(Depth)

Rough

Opening

(Width)

Clearance to
Ceiling from Top
of Arch Opening

Combustible

Floor

Combustible

Flooring

Behind

Appliance

Sides of

Appliance

Front of

Appliance

10 50-1/2 22-1/4 42-1/8 49 0 8 1/2 1/2 36

254 1283 565 1070 1245 0 203 13 13 914

10 54-1/2 22-1/4 49-1/8 45-1/4 0 8 1/2 1/2 36

254 1384 565 1248 1149 0 203 13 13 914

Figure 3.2 Clearances to Combustibles

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/08 9

D. Mantel Projections

CEILING

A

COMBUSTIBLE

FACING MATERIAL

FIREPLACE HEADER

B

NON-COMBUSTIBLE

FACING MATERIAL

7"

6"

5"

4"

3"

2"

1"

C

MINIMUM

FROM TOP OF ARCH

OPENING TO FIRST

MANTEL PROJECTION

TOP OF ARCH OPENING

1 in.

TYPICAL

12"

11"

10"

9"

8"

FROM TOP OF ARCH

OPENING TO CEILING

D

E

MINIMUM

ABCDE

in.

Cerona-36

Cerona-42

32-1/4 16-3/4 16 11 49

mm

819 425 406 279 1245

in.

28-1/2 16-3/4 16 11 45-1/4

mm

724 425 406 279 1149

Figure 3.3 Clearances to mantels or other combustibles
above appliance

CLEARANCE
TO CEILING

A

1 in.

(25)

BOTTOM OF FIREPLACE

TO BOTTOM OF

NON-COMBUSTIBLE
FACING MATERIAL

Cerona-36

Cerona-42

COMBUSTIBLE

SHEATHING

in.

mm

in.

mm

NON-COMBUSTIBLE
FACING MATERIAL
IN SHADED AREAS

FIREPLACE
ARCH OPENING

C

ABC

49 16-3/4 43-5/8

1245 425 1108

45-1/4 16-3/4 50-5/8

1149 425 1286

CEILING

B

MINIMUM

INTERIOR WALL

TOP VIEW

MANTEL LEG OR
WALL PROJECTIONS

B

A

If A minimum is _____, then B maximum is ______.

in.123456789101112

A

mm 25 51 76 102 127 152 178 203 229 254 279 305

in.123456789101112

B

mm 25 51 76 102 127 152 178 203 229 254 279 305

Figure 3.4 Clearances to Mantel Legs or Wall Projections
(Acceptable on both sides of opening.)

Figure 3.5

Note: If using the Apollo Mantel System, the appliance must

be raised 1-1/4 in. from fl oor.

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/0810

E. Hearth Extension

WARNING

Fire Risk.
Hearth extension required to protect

combustible fl oors in front of appliance.

• An 8 inch minimum hearth extension must be constructed
of non-combustible material.

8 in. min.

1 in. max.

(25 mm)

COMBUSTIBLE
SURFACE

(203 mm)

MARBLE, GRANITE, TILE OR
OTHER NON-COMBUSTIBLE
HEARTH EXTENSION

Figure 3.7 Fireplace sitting on combustible surface.

SURFACE MAY BE COMBUSTIBLE

1 INCH MAX.

TO ALLOW FOR

DOOR CLEARANCE

BOTTOM OF

FIREPLACE

NAILING TABS

(BOTH SIDES)

NON-COMBUSTIBLE

HEARTH EXTENSION

A

B

AB

Cerona-36

Cerona-42

Figure 3.6 Hearth Extension Dimensions

in. 41-1/8 8

mm 1045 203

in. 48-1/8 8

mm 1222 203

The base of the fi replace may sit on a combustible surface.
The area in front of the fi replace must be protected by a
noncombustible hearth extension, unless the fi replace is
raised a minimum of 6 inches above the combustible fl oor
or hearth. See fi gures 3.7 and 3.8.

COMBUSTIBLES

UP TO 1 INCH

THICK ALLOWED

UNDER THE OPENING

6 INCHES
MINIMUM

BOTTOM OF
FIREPLACE

Figure 3.8 Fireplace raised a minimum of 6 inches away from
combustible surface.

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/08 11

4

4

Termination Locations

A. Vent Termination Minimum Clearances

WARNING

Fire Risk.
Explosion Risk.
Inspect external vent cap regularly.

• Ensure no debris blocks cap.

• Combustible materials blocking cap may
ignite.

• Restricted air fl ow affects burner operation.

WARNING

Fire Risk.
Explosion Risk.
Maintain vent clearance to combustibles as

specifi ed.

• Do not pack air space with insulation or other
materials.

Failure to keep insulation or other materials
away from vent pipe may cause fi re.

HORIZONTAL

OVERHANG

2 FT.
MIN.

GAS DIRECT VENT
TERMINATION CAP

Roof Pitch H (Min.) Ft.

Flat to 6/12...........................................................1.0*

Over 6/12 to 7/12 .................................................1.25*

Over 7/12 to 8/12 .................................................1.5*

Over 8/12 to 9/12 .................................................2.0*

Over 9/12 to 10/12 ...............................................2.5

Over 10/12 to 11/12 .............................................3.25

Over 11/12 to 12/12 .............................................4.0

Over 12/12 to 14/12 .............................................5.0

Over 14/12 to 16/12 .............................................6.0

Over 16/12 to 18/12 .............................................7.0

Over 18/12 to 20/12 .............................................7.5

Over 20/12 to 21/12 .............................................8.0

20 INCHES MIN.

LOWEST

DISCHARGE

OPENING

H (MIN.) - MINIMUM HEIGHT FROM ROOF
TO LOWEST DISCHARGE OPENING

X

12

ROOF PITCH

VERTICAL

WALL

IS X/ 12

* 3 foot minimum in snow regions

Figure 4.2 Minimum height from roof to lowest discharge
opening

Measure vertical clearances from this surface.

Measure horizontal clearances from this surface.

(See Figure 4.4 for specifi c clearances)

Figure 4.1

Figure 4.2 specifi es minimum vent heights for various
pitched roofs.

GAS, WOOD OR FUEL

OIL TERMINATION

GAS

TERMINATION

C

A

Gas

Termination

A 6 in. 20 in. min. Horizontal distance between terminations
B 20 in. 24 in. min. Distance to perpendicular wall
C 18 in. 18 in. Vertical distance between terminations

Figure 4.3 Multiple Vertical Termination

Wood & Fuel Oil

Termination

B

Comments

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/0812

V

R

M

N

P

Q

(See Note 2)

T

S

Electrical

V

Service

D*

V

S

V

= VENT TERMINAL

V

A = 12 inches.................clearances above grade, veranda,

(See Note 1)

X

= AIR SUPPLY INLET

porch, deck or balcony

B = 12 inches.................clearances to window or door

that may be opened, or to perma­nently closed window. (Glass)

D* = 18 inches.................vertical clearance to unventilated

soffi t or to ventilated soffi t located
above the terminal

*30 inches ................for vinyl clad soffi ts and below

electrical service

F = 9 inches..................clearance to outside corner

G = 6 inches...................clearance to inside corner

H = 3 ft. (Canada) ..........not to be installed above a gas

meter/regulator assembly within 3

feet (90 cm) horizontally from the

center-line of the regulator

I = 3 ft ...........................clearance to gas service regulator

vent outlet
J = 9 inches (U.S.A.)

12 inches (Canada) clearance to non-mechanical

air supply inlet to building or the

combustion air inlet to any other

appliance
K = 3 ft. (U.S.A.)

6 ft. (Canada) ...........clearance to a mechanical (pow-

ered) air supply inlet

= AREA WHERE TERMINAL IS NOT PERMITTED

L** = 7 ft. ......................... clearance above paved

(See Note 1)

sidewalk or a paved driveway
located on public property

M*** = 18 inches................ cl earance under veranda, porch,

deck, balcony or overhang

42 inches ............... vinyl

S = 6 inches................. clearance from sides of electri-

(See Note 5)

cal service

T = 12 inches................ clearance above electrical

(See Note 5)

service

Alcove Applications

N = 6 inches ..................non-vinyl sidewalls

12 inches ................vinyl sidewalls

P = 8 ft.

Q

MIN

1 cap 3 feet 2 x Q
2 caps 6 feet 1 x Q
3 caps 9 feet 2/3 x Q
4 caps 12 feet 1/2 x Q

Q

= # termination caps x 3 R

MIN

= (2 / # termination caps) x Q

MAX

R

MAX

ACTUAL

ACTUAL

ACTUAL

ACTUAL

ACTUAL

** a vent shall not terminate directly above a sidewalk or paved driveway

which is located between two single family dwellings and serves both
dwellings.

*** only permitted if veranda, porch, deck or balcony is fully open on a

minimum of 2 sides beneath the fl oor, or meets Note 2.

Note 1: On private property where termination is less than 7 feet above a
sidewalk, driveway, deck, porch, veranda or balcony, use of a listed cap
shield is suggested. (See vents components page)

Note 2: Termination in an alcove space (spaces open only on one side
and with an overhang) are permitted with the dimensions specifi ed for
vinyl or non-vinyl siding and soffi ts. 1. There must be 3 feet minimum
between termination caps. 2. All mechanical air intakes within 10 feet
of a termination cap must be a minimum of 3 feet below the termination
cap. 3. All gravity air intakes within 3 feet of a termination cap must be a
minimum of 1 foot below the termination cap.

Note 3: Local codes or regulations may require different
clearances.

Note 4: Termination caps may be hot. Consider their proximity to
doors or other traffi c areas.

Note 5: Location of the vent termination must not interfere with
access to the electrical service.

WARNING: In the U.S: V ent system termination is NOT permitted in
screened porches. Y ou must follow side wall, overhang and ground
clearances as stated in the instructions.

In Canada: Vent system termination is NOT permitted in screened
porches. Vent system termination is permitted in porch areas with
two or more sides open. You must follow all side walls, overhang
and ground clearances as stated in the instructions.

Heat & Glo assumes no responsibility for the improper performance
of the appliance when the venting system does not meet these

Figure 4.4 Minimum Clearances for Termination

requirements.

CAUTION: IF EXTERIOR WALLS ARE FINISHED WITH VINYL SIDING, IT IS SUGGESTED THAT A VINYL PROTECTOR KIT BE INSTALLED.

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/08 13

B. Continue Adding Vent Components

WARNING

CORRECT INCORRECT

COMBUSTIBLE SURFACE

DIRECTION

UP

Fire Risk.



Installation of this appliance may require the use
of heat shield 385-290 above the fi rst 90
in the venting system.

To Install the Heat Shield:

1. Determine if the heat shield is required. Do so by measuring
the vertical distance between the top horizontal surface of
the elbow to any combustible surface above. If the distance
is more than 4 inches, the heat shield is NOT required. If it
is 4 inches or less, the heat shield IS REQUIRED. Install
per the following steps. See Figure 4.5.

COMBUSTIBLE

SURFACE

3” MIN.

HEAT

SHIELD

(76mm)

0

elbow

HEAT SHIELD

90º ELBOW

Figure 4.6

• If the combustible materials are not in place at the
time of install the elbow heat shield may be screwed
to the exhaust pipe (see Figure 4.7). Cut the tabs as
shown and bend down. Secure the heat shield to the
pipe maintaining 3 inch to 4 inch between the pipe and
shield.

SCREW

3 in.

(76 mm)

Figure 4.5

2. Fasten the shield in place using the four pilot holes
provided in the part. The shield should be oriented such
that the 13 1/8 inch dimension (longest dimension) is
running in the same direction the elbow is pointing. The
shield should be centered directly above the elbow, and
positioned so that it creates a 1/2 inch airspace between
the shield and the combustible surface. See Figure 4.6.

Figure 4.7

Refer to Cinch Pipe and Termination Cap installation in­structions.

• Continue adding vent components, locking each
succeeding component into place.

• Ensure that each succeeding vent component is securely
fi tted and locked into the preceding component in the
vent system.

• 90º elbows may be installed and rotated to any point
around the preceding component’s vertical axis. If an
elbow does not end up in a locked position with the
preceding component, attach with a minimum of two (2)
sheet metal screws.

C. Install Support Brackets

Refer to Cinch Pipe and Termination Cap installation in­structions.

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/0814

5

5

Vent Information and Diagrams

A. Vent Table Key

The abbreviations listed in this vent table key are used in
the vent diagrams.

Symbol Description

V

First section (closest to appliance) of vertical length

1

Vertical

V
H
H

Second section of vertical length

2

First section (closest to appliance) of horizontal length

1

Second section of horizontal length

2

WARNING

Fire Hazard.
Explosion Risk.
Asphyxiation Risk.
Do NOT connect this gas appliance to a chimney

fl ue serving a separate solid-fuel or gas burning
appliance.

• Vent this appliance directly outside.

• Use separate vent system for this appliance.
May impair safe operation of this appliance or

other appliances connected to the fl ue.

B. Use of Elbows

CAUTION

ALL vent confi guration specifi cations MUST be followed.

• This product is tested and listed to these specifi cations.

• Appliance performance will suffer if specifi cations are not
followed.

12 in.

8-1/2 in.

8-1/2 in.

Horizontal

Figure 5.1

C. Measuring Standards

Vertical and horizontal measurements listed in the vent
diagrams were made using the following standards.

1. Pipe measurements are shown using the effective length
of pipe (see Figure 5.2).

2. Measurements are made from the appliance outer wrap,
not from the standoffs.

3. Horizontal terminations are measured to the outside
mounting surface (fl ange of termination cap) (see
Figure 4.1).

4. V ertical terminations are measured to bottom of termi­nation cap.

5. Horizontal pipe installed level with no rise.

Diagonal runs have both vertical and horizontal vent as­pects when calculating the effects. Use the rise for the
vertical aspect and the run for the horizontal aspect (see
Figure 5.1).

Two 45º elbows may be used in place of one 90º elbow . On
45º runs, one foot of diagonal is equal to 8.5 inches hori­zontal run and 8.5 inches vertical run. A length of straight
pipe is allowed between two 45º elbows (see Figure 5.1).

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/08 15

Effective

Height/Length

DVP12MI 3 to 12 76 to 305
DVP24MI 3 to 24 76 to 610

Figure 5.2 DVP Pipe Effective Length

Pipe

DVP4 4 102

DVP6 6 152
DVP12 12 305
DVP24 24 610
DVP36 36 914
DVP48 48 1219
DVP6A 3 to 6 76 to 152

DVP12A 3 to 12 76 to 305

Effective Length

Inches Millimeters

D. Vent Diagrams

Fire Risk. Explosion Risk.
Do NOT pack insulation or other combustibles between ceiling fi restops.

• ALWAYS maintain specifi ed clearances around venting and fi restop systems.

• Install wall shield and ceiling fi restops as specifi ed.
Failure to keep insulation or other material away from vent pipe may cause fi re.

1. Top Vent - Horizontal Termination

One Elbow

H

1

WARNING

V1 Minimum H1 Maximum

Cerona-36 ONLY 1/2 ft 152 mm 2 ft 610 mm

1 ft 305 mm 2 ft 610 mm
2 ft 610 mm 5 ft 1.5 m
3 ft 914 mm 8 ft 2.4 m

V

1

4 ft 1.2 m 11 ft 3.4 m
5 ft 1.5 m 14 ft 4.3 m
6 ft 1.8 m 17 ft 5.2 m
7 ft 2.1 m 20 ft 6.1 m
8 ft 2.4 m 23 ft 7.0 m

V

= 40 ft. (12.2 m) Maximum

1

H1 = 23 ft. (7.0 m) Maximum

V1 + H1 = 63 ft. (19.2 m) Maximum

Figure 5.3

Two Elbows

H

2

INSTALLED

HORIZONTALLY

H

Note: Must have
a minimum verti­cal vent before
attaching a 9 0º
elbow to the unit.
See chart.

V1 Minimum H1 Maximum

Cerona-36 ONLY 1/2 ft 152 mm 2 ft 610 mm

1 ft 305 mm 2 ft 610 mm
2 ft 610 mm 5 ft 1.5 m
3 ft 914 mm 8 ft 2.4 m
4 ft 1.2 m 11 ft 3.4 m
5 ft 1.5 m 14 ft 4.3 m
6 ft 1.8 m 17 ft 5.2 m

V

1

1

7 ft 2.1 m 20 ft 6.1 m
8 ft 2.4 m 23 ft 7.0 m

V

+ H1 + H2= 63 ft. (19.2 m) Maximum

1

H1 + H2 = 23 ft. (7.0 m) Maximum

Note: Must have

a minimum verti­cal vent before
attaching a 9 0º
elbow to the unit.
See chart.

Minimal Vertical Vent

Model ft. mm

Cerona-36 1/2 152
Cerona-42 1 305

Minimal Vertical Vent

Model ft. mm

Cerona-36 1/2 152
Cerona-42 1 305

Figure 5.4

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/0816

1. Top Vent - Horizontal Termination - (continued)

Three Elbows

V1 Minimum H1 Maximum

Cerona-36 ONLY

1/2 ft 152 mm 3 ft 914 mm

1 ft 305 mm 4 ft 1.2 m
2 ft 610 mm 7 ft 2.1 m
3 ft 914 mm 10 ft 3.0 m

H

2

V

2

4 ft 1.2 m 13 4.0 m
5 ft 1.5 m 16 4.9 m
6 ft 1.8 m 17 5.2 m
7 ft 2.1 m 22 6.7 m

H1 + H2 = 22 ft. (6.7 m) Max.

V1+ V2 + H1 + H2 = 62 ft. (18.9 m) Max.

V

H

1

1

Note: Must have
a minimum verti­cal vent before
attaching a 9 0º
elbow to the unit.
See chart.

Minimal Vertical Vent
Model ft. mm

Cerona-36 1/2 152
Cerona-42 1 305

Figure 5.5

2. Top Vent - Vertical Termination
Straight up Vertical Venting

CAP

V1 = 50 ft. Max. (15.2 m)

Note: On vertical venting confi gurations

install the fl ue restrictor found in the
appliance manual bag. Follow flue
restrictor instructions in Section 7D.

V

1

Figure 5.6

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/08 17

2. Top Vent - Horizontal Termination - (continued)

Two Elbows

Figure 5.7

V1 Minimum H1 Maximum

Cerona-36 ONLY 1/2 ft 152 mm 2 ft 610 mm

1 ft 305 mm 2 ft 610 mm
2 ft 610 mm 5 ft 1.5 m
3 ft 914 mm 8 ft 2.4 m
4 ft 1.2 m 11 ft 3.4 m

V

2

5 ft 1.5 m 14 ft 4.3 m
6 ft 1.8 m 17 ft 5.2 m
7 ft 2.1 m 20 ft 6.1 m
8 ft 2.4 m 23 ft 7.0 m

H

= 23 ft. (7.0 m) Maximum

1

V1 + V2+ H1 = 63 ft. (19.2 m) Maximum

V

H

1

1

Note: Must have
a minimum verti­cal vent before
attaching a 9 0º
elbow to the unit.
See chart.

Minimal Vertical Vent
Model ft. mm

Cerona-36 1/2 152
Cerona-42 1 305

Three Elbows

V1 Minimum H1 Maximum

Cerona-36 ONLY 1/2 ft 152 mm 3 ft 914 mm

1 ft 305 mm 4 ft 1.2 m
2 ft 610 mm 7 ft 2.1 m
3 ft 914 mm 10 ft 3.0 m
4 ft 1.2 m 13 4.0 m
5 ft 1.5 m 16 4.9 m

V

2

H

1

H

2

INSTALLED

HORIZONTALLY

V

1

6 ft 1.8 m 17 5.2 m
7 ft 2.1 m 22 6.7 m

H1 + H2 = 22 ft. (6.7 m) Max.

+ V2 + H1 + H2 = 62 ft. (18.9 m) Max.

V

1

Note: Must have

a minimum verti­cal vent before
attaching a 9 0º
elbow to the unit.
See chart.

Minimal Vertical Vent
Model ft. mm

Cerona-36 1/2 152
Cerona-42 1 305

Figure 5.8

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/0818

6

6

Vent Clearances and Framing

A. Pipe Clearances to Combustibles

WARNING

Fire Risk.
Explosion Risk.
Maintain vent clearance to combustibles as

specifi ed.

• Do not pack air space with insulation or
other materials.

Failure to keep insulation or other materials
away from vent pipe may cause fi re.

3 in. TOP

CLEARANCE

1 in. CLEARANCE

AROUND VERTICAL

SECTIONS

1 in. SIDE AND

BOTTOM CLEARANCE

B. Wall Penetration Framing

Combustible Wall Penetration

Frame a hole in a combustible wall for an interior wall
shield fi restop, (Figure 6.3) whenever a wall is penetrated.
Use same size framing materials as those used in the wall
construction. The wall shield fi restop maintains minimum
clearances and prevents cold air infi ltration.

Non-Combustible Wall Penetration

If the hole being penetrated is surrounded by noncombus­tible materials such as concrete, a hole with diameter one
inch greater than the pipe is acceptable.

Whenever a non-combustible wall is penetrated, the wall
shield fi restop is only required on one side and no heat
shield is necessary.

If your local inspector requires the wall shield fi restop on
both sides, then both wall shield fi restops must have a heat
shield attached to them.

Figure 6.1 Pipe Clearances

Note: Heat shields MUST overlap by a minimum of 1-1/2 in. (38 mm).
The heat shield is designed to be used on a wall 4 in. to 7-1/4 in.
(102 mm to 184 mm) thick. If wall thickness is less than 4 in. (102

mm) the existing heat shields must be fi eld trimmed. If wall thickness is
greater than 7-1/4 in. (184 mm) a DVP-HSM-B will be required.

HEAT

SHIELD

WALL

SHIELD

FIRESTOP

WALL

Figure 6.2 Horizontal venting clearances to combustible
materials

3 in. TOP

CLEARANCE

SHIELD

1 in. CLEARANCE
BOTTOM & SIDES

HEAT

Shows center of 10 inch x 12 inch vent framing holes for
top and rear venting. The center of the hole is one (1) inch
(25.4 mm) above the center of the horizontal vent pipe.

B

A

AB

Cerona-36

Cerona-42

Figure 6.3 Exterior Wall Hole

in. 61-1/2 60-1/2

mm 1562 1537

in. 72 71

mm 1829 1803

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/08 19

C. Vertical Penetration Framing

WARNING

Fire Hazard
Keep loose materials or blown

insulation from touching the
vent pipe.

• National building codes recommend
using attic shield to keep loose materials/
blown insulation from contacting vent.

• Hearth & Home Technologies requires
the use of an attic shield.

Installing the Ceiling Firestop

• Frame an opening 10 inches by 10 inches
whenever the vent system penetrates a
ceiling/fl oor (see Figure 6.4).

• Frame the area with the same sized
lumber as used in ceiling/fl oor joist.

• When installing a top vent vertical
termination appliance the hole should be
directly above the appliance, unless the
fl ue is offset.

• Do not pack insulation around the vent.
Insulation must be kept away from the
pipe.

ATTIC ABOVE

10 IN. (254 MM)

10 IN.

(254 MM)

HOLE SHOULD MEASURE

10 IN. X 10 IN.

(254 MM X 254 MM)

INSIDE TO INSIDE

Installing Attic Shield
Note: An additional ceiling fi restop is not

required if attic shield is used.

• Frame opening for attic shield.

• Attic shield may be installed above or
below ceiling (see Figure 6.5).

• Secure with three fasteners on each
side.

• Fold tabs at top of attic shield in toward
vent pipe. Tabs must keep vent pipe
centered within shield.

• Field construct additional shield height if
insulation is deeper than height of attic
shield.

Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. H • 11/0820

Figure 6.4

BEND TABS IN

AROUND PIPE

3 FASTENERS

ATTIC SHIELD INSTALLED

BELOW CEILING

Figure 6.5 Installing the Attic Shield

PER SIDE

ATTIC SHIELD INSTALLED

ABOVE CEILING