Monessen Hearth SBV400, SBV500, BBV400 User Manual
B-Vent Series
Natural Vent Gas Fireplace
Installation & Operating Instructions
Models:
BBV400, SBV400, SBV500
WARNING
IF THE INFORMATION IN THESE INSTRUCTIONS IS
NOT FOLLOWED EXACTLY, A FIRE OR EXPLOSION
MAY RESULT CAUSING PROPERTY DAMAGE, PER-
SONAL INJURY OR LOSS OF LIFE.
— Do not store or use gasoline or other flam-
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 fire department.
— Installation and service must be performed
by a qualified installer, service agency or the
gas supplier.
WARNING: Improper installation, adjustment,
alteration, services or maintenance can cause
injury or property damage. Refer to this manual. For assistance or additional information
consult a qualified installer, service agency or
the gas supplier.
DUE TO HIGH TEMPERATURES, THE APPLIANCE SHOULD BE LOCATED OUT OF TRAFFIC AND AWAY FROM FURNITURE AND DRAPERIES.
CHILDREN AND ADULTS SHOULD BE ALERTED TO THE HAZARDS OF HIGH SURFACE
TEMPERATURE AND SHOULD STAY AWAY TO
AVOID BURNS OR CLOTHING IGNITION.
YOUNG CHILDREN SHOULD BE SUPERVISED
WHEN THEY ARE IN THE SAME ROOM AS THE
APPLIANCE.
CLOTHING OR OTHER FLAMMABLE MATERIAL SHOULD NOT BE PLACED ON OR NEAR
THE APPLIANCE.
KEEP THE ROOM AREA CLEAR AND FREE
FROM COMBUSTIBLE MATERIALS, GASOLINE AND OTHER FLAMMABLE VAPORS AND
LIQUIDS.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
62D4036 5/09 Rev. 9
BBV, SBV Series Natural Vent Gas Fireplaces
TABLE OF CONTENTS
Thank you and congratulations on your purchase of an MHSC Fireplace
Please read the Installation and Operation Instructions before using the appliance!
IMPORTANT: Read all instructions and warnings carefully before starting installation.
Failure to follow these instructions may result in a possible fire hazard and will void the warranty.
Important Safety Information ...........................3
Code Approval ...................................................4
Product Specifications
High Elevations ...............................................5
Gas Pressures ................................................5
Gas Specifications, Orifice Sizes ....................5
Pre-Installation Information
Before You Start ..............................................5
Fireplace Framing ...........................................6
Fireplace Location ...........................................8
Clearances .........................................................8
Secure Fireplace .................................................9
Finish Material .................................................9
Venting Installation ..........................................10
Installation Precautions .................................10
Installation Planning ......................................10
Firestops ....................................................... 11
Termination ...................................................11
Outside Combustion Air ................................12
Combustion Air Assembly .............................13
Fireplace Installation .......................................14
Check Gas Type ............................................14
Installing Gas Piping to Fireplace/Burner Sys-
tem Location .................................................14
Checking Gas Pressure ..................................16
Electrical Installation.......................................17
Electrical Wiring ............................................17
Remote Wall Mounted Switch .......................17
Electronic Pilot Ignition Wiring ......................18
Final Installation ..............................................19
Rock Wool Placement ...................................19
Log Placement .............................................19
Lava Rock and Ember Placement ................19
Operating Instructions ....................................20
What To Do If You Smell Gas ........................20
Lighting Pilot for the First Time .....................20
Lighting Pilot .................................................21
Lighting Burner ..............................................22
Lighting Electronic IGN .................................23
To Turn Off Gas .............................................23
Cleaning and Maintenance .............................24
Burner, Pilot and Control Compartment ........24
Pilot Flame ....................................................24
Burner ...........................................................24
Burner Flame ................................................24
Vent System ..................................................25
Logs ..............................................................25
Rock Wool .....................................................25
Replacement Parts ..........................................26
Firebox Components .....................................26
Logs ..............................................................26
Standing Pilot - Millivolt Control ....................28
Electronic Ignition ..........................................30
Troubleshooting ..............................................32
Warranty ...........................................................39
2
62D4036
IMPORTANT SAFETY INFORMATION
BBV, SBV Series Natural Vent Gas Fireplaces
INSTALLER
Please leave these instructions with the appliance.
• Read this owner’s manual carefully and completely before trying to assemble, operate,
or service this fireplace.
• Any change to this fireplace or its controls can be dangerous.
• Improper installation or use of this fireplace can cause serious injury or death from
WARNING
fire, burns, explosions, electrical shock and carbon monoxide poisoning.
This fireplace is a decorative gas appliance. This fireplace must be properly installed by a qualified service
person.
CARBON MONOXIDE POISONING: Early signs of
carbon monoxide poisoning are similar to the flue with
headaches, dizziness and/or nausea. If you have these
signs, the fireplace may not have been installed properly.
Get fresh air at once! Have the fireplace inspected and
serviced by a qualified service person. Some people are
more affected by carbon monoxide than others. These
include pregnant women, people with heart or lung disease or anemia, those under the influence of alcohol,
and those at high altitudes.
Propane/LP gas and natural gas are both odorless. An
odor-making agent is added to each of these gases. The
odor helps you detect a gas leak. However, the odor
added to these gases can fade. Gas may be present
even though no odor exists.
Make certain you read and understand all warnings.
Keep this manual for reference. It is your guide to safe
and proper operation of this fireplace.
1. This appliance is only for use with the type of gas
indicated on the rating plate. This appliance is not
convertible for use with other gases unless a certified kit is used.
2. For propane/LP fireplace, do not place propane/LP
supply tank(s) inside any structure. Locate propane/
LP supply tank(s) outdoors. To prevent performance
problems, do not use propane/LP fuel tank of less
than 100 lbs. capacity.
3. If you smell gas:
• shut off gas supply
• 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 neigh-
bor’s phone. Follow the gas supplier’s instructions.
OWNER
Please retain these instructions for future reference.
4. Never install the fireplace:
• in a recreational vehicle
• where curtains, furniture, clothing, or other flam-
mable objects are less than 42” from the front,
top or sides of the fireplace
• in high traffic areas
• in windy or drafty areas
5. This fireplace reaches high temperatures. Keep
children and adults away form hot surfaces to avoid
burns or clothing ignition. Fireplace will remain hot
for a time after shutdown. Allow surfaces to cool before touching.
6. Carefully supervise young children when they are in
the room with fireplace.
7. Do not modify fireplace under any circumstances.
Any parts removed for servicing must be replaced
prior to operating fireplace.
8. Turn fireplace off and allow to cool before servicing, installing or repairing. Only a qualified service
person should install, service or repair the fireplace.
Have burner system inspected annually by a qualified service person.
9. You must keep control compartments, burners and
circulating air passages clean. More frequent cleaning may be needed due to excessive lint and dust
form carpeting, bedding material, pet hair, etc. turn
off the gas valve and pilot light before cleaning fireplace.
10. Have venting system inspected annually by a qualified service person. If needed, have venting system
cleaned or repaired. Refer to Cleaning and Mainte-
nance, Page 24.
11. Keep the area around your fireplace clear of combustible materials, gasoline and other flammable vapor and liquids. Do not run fireplace where these are
used or stored. Do not place items such as clothing
or decorations on or around fireplace.
12. Do not use this fireplace to cook food or burn paper
or other objects.
13. Never place anything on top of fireplace.
62D4036
Continued on Page 4
3
BBV, SBV Series Natural Vent Gas Fireplaces
Continued on Page 4
14. Do not use any solid fuels (wood, coal, paper, cardboard, etc.) in this fireplace. Use only the gas type
indicated on rating plate.
15. This appliance, when installed, must be electrically
grounded in accordance with local codes or in the
absence of local codes, with the National Electri-
cal Code, ANSI/NFPA 70 or the Canadian Electrical
Code, CSA C22.1.
16. Do not obstruct the flow of combustion and ventilation
air in any way. Provide adequate clearances around
air openings into the combustion chamber along with
adequate accessibility clearance for servicing and
proper operation.
17. When the appliance is installed directly on carpeting,
tile or other combustible material other than wood
flooring, you must set appliance on a metal or wood
panel or hearth pad extending the full width and depth
of the appliance.
18. Do not use fireplace if any part has been exposed to
or has been under water. Immediately call a qualified service person to arrange for replacement of the
unit.
19. Do not operate fireplace if any log is broken.
20. Do not use a blower fireplace, heat exchanger fireplace or any other accessory not approved for use
with this fireplace.
21. The fireplace is not intended for use with a thermostat.
22. This appliance must be installed with draft hood in
same atmospheric pressure zone as the combustion
air inlet to the appliance.
23. For Massachusetts Residents Only: This product
must be installed by a licensed plumber or gas fitter
when installed within the Commonwealth of Massachusetts. Flexline installation must not exceed 36”.
IMPORTANT SAFETY INFORMATION
IMPORTANT:
PLEASE READ THE FOLLOWING CAREFULLY
It is not unusual for gas fireplace to give off some odor
the first time it is burned. This is due to the manufacturing process.
Please ensure that your room is well ventilated during burn off - open all windows.
It is recommended that you burn your fireplace for at
least en (10) hours the first time you use it.
IMPORTANT:
PLEASE READ THE FOLLOWING CAREFULLY
It is normal for fireplaces fabricated of steel to give off
some expansion and/or contraction noises during the
start up or cool down cycle. Similar noises are found
with your furnace heat exchanger or car engine.
Never connect unit to private
(non-utility) gas wells. This gas is commonly known as wellhead gas.
WARNING
Proposition 65 Warning: Fuels listed in gas, wood burning or oil fired appliances,
and the products of combustion of such fuels, contain chemicals known to the State
of California to cause cancer, birth defects and other reproductive harm.
California Health and Safety Code Sec. 25249.6
WARNING
CODE APPROVAL
These appliances have been tested by CSA and found to comply with the established standards
for VENTED GAS FIREPACES in the US and Canada as follows:
LISTED VENTED GAS FIREPLACE
TESTED TO: ANSI Z21.50a-2008 CSA2.22a-2008
4
62D4036
PRODUCT FEATURES
BBV, SBV Series Natural Vent Gas Fireplaces
PRODUCT SPECIFICATIONS
• This appliance has been certified for use with either
natural or propane gas. See appropriate data plates.
• This appliance is not for use with solid fuels.
• The appliance must be installed in accordance with
local codes if any. If none exist use the current installation code, ANSI Z223.1/NFPA 54 in the US and
CSA B149 in Canada.
• The appliance must be properly connected to a vent-
ing system.
• The appliance is not approved for closet or recessed
installations.
1/2”
Nailing
Flange
5/8”
Nailing
Flanges
FP1920
Gas Control
(not shown)
Figure 1 BBV/SBV Fireplace
1/2”
Nailing
Flange
HIGH ELEVATIONS
Input ratings are shown in BTU per hour and are certified without deration for elevations up to 4,500 feet
(1,370 m) above sea level.
For elevations above 4,500 feet (1,370 m) in USA, installation must be in accordance with the current ANSI
Z223.1/NFPA 54 and/or local codes having jurisdiction.
In Canada, please consult provincial and/or local authorities having jurisdiciton for installation at elevations
above 4,500 feet (1,370 m).
GAS PRESSURES
Natural Propane (LP)
Inlet Minimum 4.5” w.c. 11.0” w.c.
Inlet Maximum 10.5” w.c. 13.0” w.c.
Manifold Pressure 3.5” w.c. 10.0” w.c.
GAS SPECIFICATIONS & ORIFICE SIZE
Max.Input Min. Input Orifice
Model Fuel BTU/h BTU/h Size
BBV400NV Nat. 22,000 16,000 #43
BBV400PV LP 22,000 14,500 #55
SBV400NV Nat. 29,000 16,500 #41
SBV400PV LP 29,000 16,300 #53
SBV500NV Nat. 31,500 19,000 #37
SBV500PV LP 31,500 20,000 #52
BEFORE YOU START
Read this homeowner manual thoroughly and follow all
instructions carefully. Inspect all contents for shipping
damage and immediately inform your dealer if any damage is found. Do not install any unit with damaged, incomplete, or substitute parts. Check your packing list to verify
that all listed parts have been received. You should have
the following:
• Fireplace (Firebox and Burner System)
• Log Set • Volcanic Rock
• Rock Wool • White Toggle Switch
• Switch Cover Plate • Plastic Bag (1)
• Ziplock Bag 2” x 3” x 3”
ITEMS REQUIRED FOR INSTALLATION
• Phillips Screwdriver • Framing Materials
• Hammer • Wall Finishing Materials
• Saw and/or saber saw • Level
• Electric Drill and Bits • Tee Joint
• Pliers • Measuring Tape
• Square • Pipe Wrench
• Caulking Material (Noncombustible)
• Fireplace Surround Material (Noncombustible)
• Piping Complying with Local Codes
• Pipe Sealant Approved for use with Propane/LPG
(Resistant to Sulfur Compounds)
62D4036
5
BBV, SBV Series Natural Vent Gas Fireplaces
316” (797 mm)
8”
(203 mm)
14”
(356 mm)
1456O”
(368 mm)
Min. Rough
Opening
Depth
4056O” (1029 mm)
Min. Rough Opening Width
4”
B-Vent
1/2” or 5/8”
Drywall
Spacers
40"
(1016 mm)
34”
(864 mm)
2156O”
(546 mm)
36” (914 mm)
40” (1016 mm)
4056O”
(1029 mm)
Min. Rough
Opening
Height
1/2" or 5/8"
Drywall
Spacers
166M”
(426 mm)
756M”
(184 mm)
26QE”
(56 mm)
96”
(244 mm)
436" (1102 mm)
61
56M” (1556 mm)
30
6
”
(778 mm)
436" (1102 mm)
6”
(152 mm)
FIREPLACE DIMENSIONS & FRAMING
FIREPLACE FRAMING
Firebox framing can be built before or after the appliance is set in place. Construct firebox framing
following Figures 2 or 3 for your specific installation requirements. Refer to Figures 2 & 3 for firebox
dimensions. The framing headers may rest on the top of the firebox standoffs.
The firebox may be installed directly on a combustible floor or raised on a platform of an appropriate height. When the firebox is installed directly on carpeting, tile or other combustible material,
other than wood flooring, the firebox shall be installed on a metal or wood panel extending the full
width and depth of the enclosure.
6
Figure 2 BBV400 Fireplace
Dimensions and
Framing
Do not fill spaces around firebox with
insulation or other materials. This could
cause a fire.
WARNING
62D4036
FIREPLACE DIMENSIONS & FRAMING
21”
(533 mm)
2156O”
(546 mm)
Min. Rough
Opening
Depth
4”
B-Vent
1/2” or 5/8”
Drywall
Spacers
40"
(1016 mm)
34”
(864 mm)
2156O”
(546 mm)
B
A
4056O”
(1029 mm)
Min. Rough
Opening
Height
1/2" or 5/8"
Drywall
Spacers
166M”
(426 mm)
756M”
(184 mm)
26QE”
(56 mm)
96”
(244 mm)
D - Min. Rough Opening Width
656O”
(165 mm)
13(6QE”
(341 mm)
C
E
F
G
G
6”
(152 mm)
BBV, SBV Series Natural Vent Gas Fireplaces
Figure 3 SBV400, SBV500 Fireplace
Dimensions and Framing
Ref. SBV400 SBV500
A 40” (1016 mm) 46” (1168 mm)
B 36” (914 mm) 42” (1067 mm)
C 24ZC\zn” (630 mm) 30ZC\zn” (783 mm)
D 40Z\x” (1029 mm) 46Z\x” (1181 mm)
Framing Dimensions
E 67M\,” (1724 mm) 73M\,” (1876 mm)
F 34” (864 mm) 37” (940 mm)
G 48” (1219 mm) 52Z\v” (1327 mm)
For easier installation on SBV400 and SBV500
units, place gas supply pipe 6” to 8” inside
unit. Measure from the center of the gas
NOTE
knock-out hole located at the bottom of the
left side.
62D4036
7
BBV, SBV Series Natural Vent Gas Fireplaces
PRE-INSTALLATION INFORMATION
FIREPLACE LOCATION
Plan for the installation of your appliance. This includes determining where the unit is to be installed,
the vent configuration to be used, framing and finishing details, and whether any optional accessories (i.e. wall switch, or remote control) are desired. Consult your local building code agency to
ensure compliance with local codes, including permits and inspections.
The following factors should be taken into consideration:
• Clearance to side-wall, ceiling, woodwork and windows. Minimum clearances to combustibles
must be maintained.
• This fireplace may be installed along a wall, across a corner or use an exterior chase.
• Location should be out of high traffic areas and away form furniture and draperies due to heat
from appliance.
• Never obstruct the front opening of the fireplace.
• Do not install in the vicinity where gasoline or other flammable liquids may be stored.
• Vent pipe routing. Refer to Venting section found in this manual for allowable venting configura-
tions.
• These units can be installed in a bedroom. Refer to the National Fuel Gas Code ANSI Z233.1/
NFPA 54 - (current edition), the Uniform Mechanical Code - (current edition), and Local Building
Codes for specific installation requirements.
CLEARANCES TO COMBUSTIBLES
Follow these instructions carefully
to ensure safe installation. Failure to
follow instructions exactly can create a fire hazard.
The appliance cannot be installed on
a carpet, tile or other combustible
material other than wood flooring. If
installed on carpet or vinyl flooring,
WARNING
the appliance shall be installed on a
metal, wood or noncombustible material panel extending full width and
depth of the appliance.
72”
Minimum
Minimum 3” From
Both Side Walls
to
Opening
Side Wall
Combustible
Mantel
12” Maximum
Depth
8” Minimum
Figure 4 Clearances
8
FP2406
62D4036
SECURE FIREPLACE TO FLOOR OR FRAMING
The fireplace must be secured to
the floor and/or to framing studs
as shown in Figure 5. Use two (2)
wood screws or masonry/concrete screws to secure fireplace
to the floor. Use four (4) screws
to attach fireplace to framing.
The side brackets are adjustable from 1/2” to 5/8” to accommodate different thicknesses of
material.
Framing
1/2” Nail
Flange
Screws
5/8” Nail Flange
BBV, SBV Series Natural Vent Gas Fireplaces
Framing
1/2” Nail
Flange
Screws
1/2” Nail
Flange
Screws
Figure 6 Secure Fireplace to Floor and Framing Studs
FINISHING MATERIAL
NOTE: Any remote wiring (i.e. remote control and wall switch) must be done prior to final finishing to avoid costly reconstruction.
Never obstruct or modify
the air inlet. This may create
a fire hazard.
WARNING
5/8” Nail
Flange
FP2019
1/2” Nail
Flange
Only noncombustible materials (i.e. brick, tile, slate, steel or other materials with a UL fire rating of Zero)
may be used to cover the black surface of the appliance. A 300° F minimum adhesive may be used to
attach facing materials to the black surface. If joints between the finished wall and the fireplace surround are sealed, a 300° F minimum sealant material (General Electric RTV 103 or equivalent) must
be used.
62D4036
9
BBV, SBV Series Natural Vent Gas Fireplaces
Read all instructions completely and thoroughly before attempting installation.
Failure to do so could result in serious injury, property damage or loss of life.
Operation of improperly installed and maintained venting system could result in
serious injury, property damage or loss of life.
WARNING
Chimney centerline dimensions are referenced on Pages
Failure to follow these instructions will void the warranty.
NOTICE
INSTALLATION PRECAUTIONS
Consult local building codes before beginning the installation. The installer must make sure to select the proper
vent system for installation. Before installing vent kit, the
installer must read this fireplace manual and vent kit instructions.
Only a qualified installer/service person should install
venting system. The installer must follow these safety
rules:
• Wear gloves and safety glasses for protection.
• Use extreme caution when using ladders or when
on rooftops.
• Be aware of electrical wiring locations in walls and
ceilings.
The following actions will void the warranty on your venting system:
• Installation of any damaged venting component.
• Unauthorized modification of the venting system.
• Installation of any component part not manufac-
tured or approved by MHSC.
• Installation other than permitted by these instruc-
tions.
INSTALLATION PLANNING
“B” VENT PIPE
See venting installation instructions provided by the BVent manufacturer.
NOTE: This APPLIANCE MUST BE INSTALLED using
“B” vent type pipe that has been listed by a nationally recognized testing agency.
Refer to B-Vent Pipe Sizing chart for proper elbow offset
runs.
B-Vent Pipe Sizing
BBV400 SBV400 SBV500
4” 6” 6”
10
6 & 7, Figures 2 & 3.
• Minimum vertical chimney height - 8’ as measured
from top of unit to top of termination.
• Minimum vertical height - 40’ as measured from top
of unit to top of termination.
• Minimum chimney height with two (2) 90° elbows
- 8’.
• Elbow requirements: Allow a maximum of two (2)
90° elbows or four (4) 45° elbows per installation.
NOTE: Two (2) 45° elbows = one (1) 90° elbow
• Horizontal run must never exceed 50% of the height
of the vent system. Horizontal runs are measured
center pipe to center pipe.
• Horizontal runs must have a minimum 1/4” rise per
foot and may not run level or down hill.
Attaching 4” Flue to BBV:
• The first section of B-vent flue should overlap
the appliance collar. The appliance collar may be
crimped to ease the installation of the first section
of flue.
• Do not penetrate the pipe inner liner with sheet met-
al screws. Attach the initial flue section to the top
of the firebox chassis with 1/4” self-tapping screws
and plumbers strap. Attach the strap toward the
bottom of the flue section and pull taut for proper
tension to the firebox.
Attaching 6” Flue to SBV:
• The 6” appliance collar is slightly larger that the in-
ner wall of most B-vent 6” pipe sections. Install the
first section of B-vent by slipping the flue’s inner
wall tot he inside of the appliance collar. The B-vent
outer wall will slip to the outside of the appliance
collar.
• Do not penetrate the pipe inner line with sheet met-
al screws. Attach the initial flue section tot he top
of the firebox chassis with 1/4” self-tapping screws
and plumber’s strap. Attach the strap toward the
bottom of the flue section and pull taut for proper
tension to the firebox.
Support the Pipe
• Support horizontal runs a minimum of every five (5)
feet. Refer to vent manufacturer’s instructions for
proper support on vertical runs (45° or less).
• Support offsets so the weight of the pipe is not bear-
ing down on the elbows.
VENT INSTALLATION
62D4036
VENT INSTALLATION
H
X
12”
FIRESTOPS
• Locate chimney centerline dimension from a com-
bustible back wall. Figures 2 & 3. Minimum firestop
dimensions are found in the vent manufacturer’s instructions. Clearances to combustibles may also be
found on the sides of the flue sections.
• Avoid cutting any load-bearing framing members.
Figures 6 & 7
To position firestop refer to Figures 6 & 7. Only one firestop
is required per frame.
Nails
Figure 6 Install Firestop in Attic
Firestop
Spacer
BBV, SBV Series Natural Vent Gas Fireplaces
NOTICE: When installing in a chase, you should insulate the chase as you would the outside walls of your
home. This is especially important in cold climates.
Insulation should be considered a combustible material. Maintain proper clearances to all combustible
materials.
NOTICE: Treatment of firestops and construction of
the chase may vary from building type to building
type. These instructions are not substitutes for the
requirements of local building codes. You must follow all local building codes.
TERMINATE THE PIPE
• Maintain proper clearance to the roof using the
chart below.
• Vents shall terminate at least 8’ from a vertical
wall.
• Maintain 2’ minimum clearance to any other gas
terminations or plumbing vents, as measured from
the outside edge of the terminations or vents.
Figure 7 Install Firestop
in Ceiling
Firestop
Spacer
Joist
Nails
Joist
FP2020
FP2405
Figure 8 Minimum Chimney Height
Termination Height Table
Use this table to determine the minimum height avove
the roof
Minimum Height
Roof Pitch Feet Meters
Flat to 7/12 1 0.3
Over 7/12 to 8/12 1.5 0.46
Over 8/12 to 9/12 2 0.61
Over 9/12 to 10/12 2.5 0.76
Over 10/12 to 11/12 3.25 0.99
Over 11/2 to 12/12 4 1.22
Over 12/12 to 14/12 5 1.52
62D4036
11
BBV, SBV Series Natural Vent Gas Fireplaces
NOTE: The use of outside air for combustion is optional unless required by building
codes. It is only necessary to supply outside
combustion air to one side of fireplace. Use
model OAC4 combustion air kit (refer to Page
17).
1. Avoid extremely long runs and numer-
ous turns in duct leading from fireplace
to combustion air assembly. These conditions increase the resistance to free flow
of air through duct. Figures 9 and 10
2. Locate combustion air assembly at an
exterior location. Make sure the location
cannot be accidentally blocked. Locate
assembly above snow line to prevent
snow from blocking assembly.
3. Never mount combustion air inlet assem-
bly in garage or storage area where combustible fumes (gasoline) might be drawn
into fireplace.
4. Combustion air may be drawn from crawl
space under house when adequate supply of air is provided by open ventilation.
Figure 9
NOTE: Never take combustion air from attic
space or garage space.
NOTE: Install outside combustion air ONLY
ON LEFT-HAND SIDE of fireplace.
OUTSIDE COMBUSTION AIR
Duct Extended to Miss
Joist
To Outside
Wall
Figure 9 Install Unit Above Basement or Crawl Space
FP2021
12
Inlet Grille
in Soffit
(Overhang)
8” Maximum
FP2022
Figure 10 Install Unit on Concrete Slab with Optional Outside Air Runs
62D4036
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