Vermont Casting DVHVAC36 User Manual

CER TIF IED

D

E

S

I

G

N

C

E

R

T

I

F

I

E

D

Rear Direct Vent
Model: DVHVAC36

INSTALLER/CONSUMER

SAFETY INFORMATION

PLEASE READ THIS MANUAL
BEFORE INSTALLING AND USING
APPLIANCE

WARNING!
IF THE INFORMATION IN THIS
MANUAL IS NOT FOLLOWED
EXACTLY, A FIRE OR EXPLOSION
MAY RESULT CAUSING PROPERTY
DAMAGE, PERSONAL INJURY OR
LOSS OF LIFE.

FOR YOUR SAFETY
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.

WHAT TO DO IF YOU SMELL GAS:

• Do not try to light any appliance.

• Do not touch any electric switch; do

not use any phone in your

building.

• Immediately call your gas supplier

from your neighbor's phone. Follow
the gas suppliers instructions.

• If you cannot reach your gas supplier

call the fire department.

DO NOT STORE OR USE
GASOLINE OR OTHER
FLAMMABLE VAPORS AND
LIQUIDS IN THE VICINITY OF THIS
OR ANY OTHER APPLIANCE.

Homeowner's Installation

and Operating Manual

INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.

10001195 1/07 Rev. 5

DVHVAC36

Table of Contents

PLEASE READ THE INSTALLATION & OPERATING INSTRUCTIONS BEFORE USING APPLIANCE.
Thank you and congratulations on your purchase of a CFM Corporation fireplace.
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.

Installation & Operating Instructions

Important Instructions ..........................................................................................................................

Fireplace Dimensions ..........................................................................................................................

Locating Your Fireplace .......................................................................................................................5

Clearance to Combustibles .................................................................................................................

Unit Assembly ......................................................................................................................................5

Framing and Finishing .........................................................................................................................6

Supply Air Duct Systems .....................................................................................................................

Mantel .............................................................................................................................................6

Return Air Plenum ...............................................................................................................................

Air Conditioning ...................................................................................................................................6

Final Finishing .....................................................................................................................................7

Hearth .............................................................................................................................................

Gas Inlet and Manifold Pressures .......................................................................................................7

High Elevations ....................................................................................................................................

Gas Specifications ...............................................................................................................................7

Gas Line Installation ............................................................................................................................7

Electrical Specifications .......................................................................................................................

Electrical .............................................................................................................................................9

General Venting Information

General Venting ..................................................................................................................................

General Venting Information - Termination Location .........................................................................10

General Information Assembling Vent Pipes .....................................................................................11

Twist Lock Pipes ................................................................................................................................11

How to Use the Vent Graph ...............................................................................................................12

Sidewall Venting Graph .....................................................................................................................12

Corner Installation .............................................................................................................................12

Rear Wall Venting Applications & Installation ....................................................................................

Vertical Sidewall Applications & Installation .......................................................................................13

Below Grade Installation ....................................................................................................................

Vertical Through-the-Roof Applications & Installation ........................................................................17

Twist Lock Venting Components .......................................................................................................19

Operating Instructions

General Glass Information .................................................................................................................20

Louvre Removal ................................................................................................................................

Window Frame Assembly Removal ...................................................................................................20

Glass Cleaning ..................................................................................................................................20

Installation of Logs, Lava Rock & Ember Material .............................................................................

Setting Temperature Rise ..................................................................................................................21

Lava Rock ..........................................................................................................................................

Flame Adjustment ..............................................................................................................................21

Emergency Heat ................................................................................................................................21

Flame Characteristics ........................................................................................................................

Inspecting the Venting System ..........................................................................................................22

Inspecting the Venting/Heating Exchange System ............................................................................

Ceramic Refractory Installation .........................................................................................................22

Lighting and Operating Instructions ...................................................................................................23

Troubleshooting .................................................................................................................................

Maintenance

Cleaning the Standing Pilot Control System ......................................................................................

Replacement Parts .......................................................................................................................................26

Optional Accessories

Decorative Bay Window ....................................................................................................................

Warranty ........................................................................................................................................................29

Energuide ......................................................................................................................................................30

3
4

5

6

6

7

7

8

9

12

16

20

21

21

21

22

24

25

28

2

10001195

Installation & Operating Instructions

DVHVAC36

This gas fireplace should be installed by a qualified
installer in accordance with local building codes and with
current CSA-B149.1 Installation codes for Gas Burning
Fireplaces and Equipment. For U.S.A Installations follow
local codes and/or the current National Fuel Gas Code.
ANSI Z223.1/NFPA 54.

In the Commonwealth of Massachusetts, all gas fitting
and installation of this heater shall only be done by a
licensed gas fitter or licensed plumber.

FOR SAFE INSTALLATION AND OPERATION PLEASE
NOTE THE FOLLOWING:

1. This fireplace gives off high temperatures and should
be located out of high traffic areas and away from
furniture and draperies.

2. Children and adults should be alerted to the hazards
of the high surface temperatures of this fireplace and
should stay away to avoid burns or ignition of clothing.

3. Children should be carefully supervised when they are
in the same room as your fireplace.

4. Under no circumstances should this fireplace be modi
fied. Parts removed for servicing should be replaced
prior to operating this fireplace again.

5. Installation and any repairs to this fireplace should
be carried out by a qualified service person. A profes
sional service person should be contacted to inspect
this fireplace annually. Make it a practice to have all of
your gas fireplaces checked annually. More frequent
cleaning may be required due to excess lint and dust
from carpeting, bedding material, etc.

6. Control compartments, burners and air passages in
this fireplace should be kept clean and free of dust
and lint. Make sure that the gas valve and pilot light
are turned off before you attempt to clean this fire­place.

7. The venting system (chimney) of this fireplace should
be checked at least once a year and if needed your
venting system should be cleaned.

8. Keep the area around your fireplace clear of combusti
ble materials, gasoline and other flammable vapor and
liquids. This fireplace should not be used as a drying
rack for clothing, nor should Christmas stockings or
decorations be hung in the area of it.

9. Under no circumstances should any solid fuels (wood,
coal, paper or cardboard etc.) be used in this fire
place.

10. The flow of combustion and ventilation air must not
be obstructed in any way.

11. Whether the fireplace is installed directly on
carpeting, vinyl tile or any combustible material other
than wood, this fireplace must be installed on a metal
or wood panel extending the full width and depth of
the fireplace.

-

-

12. This fireplace requires adequate ventilation and
combustion air to operate properly.

13. The unit must be adjusted to obtain a temperature
rise of 25-55°F, at maximum input rate.

14. The fireplace must be electrically grounded in
accordance with local codes. In the United States,
all electrical and grounding must also conform to the
current National Electric Code, ANSI/NFPA No. 70. In
Canada, all electrical and grounding for the unit must
also conform to the current Canadian Electrical Code
Part 1, CSA Standard C22.1

15. Field wiring to the appliance must meet or exceed
the specifications for type T wire and must withstand a
minimum of 180°F temperature rise.

16. Service access must be provided for the service and
replacement of the blower motor, air filter etc. The use
of CFM Corporation mantels designed for this product
is recommended.

IMPORTANT:

PLEASE REVIEW 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.

It is not unusual for your CFM Corporation gas
fireplace to give off some odor the first time it is
burned. This is due to the curing of the paint and any
undetected oil from the manufacturing process.

Please ensure that your room is well ventilated - open
all windows.

It is recommended that you burn your fireplace for at
least ten (10) hours the first time you use it.

The appliance may be installed in an aftermarket
permanently located, manufactured (mobile) home,
where not prohibited by local codes.

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.

Proposition 65 Warning: Fuels used 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 & Safety Code Sec. 25249.6

10001195

3

DVHVAC36

W

U

V

L

X

F

I

C

D

A

E

B

G

H

V

T

J

K

R

O

N

M

L

P

S

Q

Z

Fireplace Dimensions

Fig. 2 Fireplace specifications.

Ref. DVHVAC36 Ref. DVHVAC36
A 36" (914 mm) N 9
B 34

¹⁄₄" (870 mm) O 6⁷⁄₈" (175 mm)

C 21" (533 mm) P 2

⁵⁄₈" (245 mm)

⁹⁄₃₂" (58 mm)

D 33" (838 mm) Q 2" (51 mm)
E 63

⁵¹⁄₆₄" (1621 mm) R 3¹³⁄₁₆" (97 mm)
F 70" (1780 mm) S 4" (102 mm)
G 16
H 21
I 38
J 28
K 33
L 18
M 13

⁵⁄₃₂" (410 mm) T 1/2" (13 mm)
⁵⁄₃₂" (537 mm) U 18" (457 mm)
³⁄₁₆" (970 mm) V 16⁷⁄₂₁" (412 mm)

¹⁵⁄₁₆" (735 mm) W 83¹⁄₈" (2111 mm)

¹⁄₂" (851 mm) X 5³⁄₈" (136 mm)

³⁄₁₆" (462 mm) Y 58³⁄₄" (1493 mm)

²¹⁄₃₂" (347 mm) Z 41⁹⁄₁₆" (1056 mm)

4

10001195

DVHVAC36

Y D

F

X

X

AE

B

C

Y

Locating Your Gas Fireplace

LU584-3

Fig. 1 Locate gas fireplace.

A) Flat on wall B) Cross corner C) **Island
D) *Room divider E) *Flat on wall corner F) Chase installation
Y) 6" minimum

NOTE (Fig. 1):
** Island (C) and Room Divider (D) installation is possible as
long as the horizontal portion of the vent system (X) does not
exceed 20' (6m). See details in Venting Section.
* When you install your CFM Corporation fireplace in (D) Room
divider or (E) Flat on wall corner positions (Y), a minimum of 6"
(153mm) clearance must be maintained from the perpendicular
wall and the front of the fireplace.

5. Attach the metal conduit from the fireplace cabinet
to the 7/8" diameter hole in the side of the air cir­culating blower section using the nut provided. Do
not feed the two yellow wires which are outside the
conduit through the hole. Insert the terminal on the
white wire (common) into position 1 on the jack plug.
Insert the terminal on the black wire (cooling speed)
into position 2 on the jack plug. Insert the terminal on
the red wire (heating speed), into position 3, 4 or 5
on the jack plug. If unsure, select position 4 on the
jack plug for heating speed and adjust if necessary.
If desired the speed selections can be changed later.
Refer to Figure 8 Wiring Diagram.

WARNING:

Ensure that all three wires are properly
inserted into jack plug, even if an optional air condi­tioner is not to be used.

6. Reinstall jack plug into motor and replace access
panel.

7. Place the coil cabinet section onto the right side of
the fireplace cabinet so the access panel faces the
front of the unit. (Fig. 3) Remove the access panel
and secure the coil cabinet to the fireplace cabinet
using 8 of the #8 screws provided.

8. Connect the 1/4" quick connect terminals of the two
yellow wires from the fireplace cabinet to the high
limit safety control located on the top of the coil cabi­net.

Clearance to Combustibles

Back .............................................................. 0" (0 mm)

Side ............................................................... 0" (0 mm)

Floor .............................................................. 0" (0 mm)

Top ................................................................ 0" (0 mm)

Flue ...................................................... 2" (51 mm) Top

..............................................1" (25 mm) Sides/Bottom

Unit Assembly

The DVHVAC36 is shipped in three cartons. The first
carton contains the fireplace cabinet. The second car­ton contains the air circulating blower section and the
third carton contains the coil cabinet. Unpack all three
sections before following the assembly instructions:

1. Place the air circulating blower section onto the left
side of the fireplace cabinet. (Fig. 3)

2. Ensure the damper plate below the blower assembly
works freely without binding. Rotate it downwards
and ensure that it returns to a closed position.

3. Secure air circulating blower section to fireplace
cabinet using 8 of the #8 screws provided.

4. Remove the access panel on the front of the air cir
culating blower section by removing the #10-24 nuts.
Remove the jack plug from the air circulating blower
motor by gently depressing tab.

-

Blower Section

Coil Cabinet

Fireplace Cabinet

FP1399

Fig. 3 DVHVAC36 unit assembly.

10001195

5

DVHVAC36

C

A

B

A

B

D

C

Framing and Finishing

1. Choose fireplace location.

2. Place fireplace into position and secure to floor with
1

¹⁄₂" screws, or nails. The holes to secure the fire­place to the floor are located just behind the access
door grille on the left and right hand side of the
fireplace.

Adjustable Drywall Strip

(Nailing Flange)

Screw Drywall
Position Depth
A 1/2" (13 mm)
B 5/8" (16 mm)
C 3/4" (19 mm)

Adjustable

1/2", 5/8" &

3/4" Spacing

Fig. 4 Adjustable drywall strip (nailing flange).

3. Frame in fireplace. It is important to allow for finished
face when setting the depth of the frame.

4. Attach fireplace to frame using adjustable frame
drywall strips (located behind access door for ship­ping). Preset depth to suit facing material (adjustable
to 1/2", 5/8" or 3/4" depths). (Fig. 4)

5. Screw through slotted holes in drywall strip and then
screw into pre-drilled holes on fireplace side. Meas
ure from face of fireplace to face of drywall strip to
determine final depth. (Fig. 4)

Supply Air Duct Systems

The DVHVAC36 fireplace has three 6" (152 mm) diam­eter supply air outlets. Duct runs of up to 65 equivalent
feet (19.8 m) using 6" (152 mm) round duct (or equiva­lent), are permissible. Duct runs of up to 40 equivalent
feet (12.2 m) are permitted using 5" (127 mm) round
duct (or equivalent). Runs of up to 30 equivalent feet
(9 m) are permitted when using 4" (102 mm) round duct
(or equivalent). In all cases, size and install the supply
air system using industry approved standards which
result in a quiet and low static system.

FP1023

Mantel

Top Louvre Opening

Side View

Front Glass

Electrical
Knock­Out

FP1400

Optional Hearth

Gas Knock-Out

Electrical Cable
Knock-Out

Mantel Chart

Ref. From Top Ref. Depth
Louvre (Min.) (Max.)

A 15

¹⁄₅" (394 mm) C 7" (178 mm)

B 48" (1219 mm) D any

Mantel Leg Chart

From Fireplace Depth

-

Side (Min.) (Max.)

7

Fig. 5 Combustible mantel installation.

¹⁄₂" (191 mm) 1³⁄₄" (44 mm)

Return Air Plenum

The DVHVAC36 is equipped with a 16" x 16" (256 x
256 mm) return air duct connection. Size and install the
return air system using industry approved standards
that result in a quiet and low static system.

Air Conditioning

The coil cabinet has been sized to fit most major brands
of evaporator coil. (Fig. 6) The brackets supplied inside
the coil cabinet represent the lowest height above the
fireplace cabinet that the coil may be mounted. For best
results, it is recommended that low air restriction types

6

10001195

DVHVAC36

A

B

C

D

E

of coils be used with this product. When using 4" or 5"
(102 or 127 mm) diameter duct work, the maximum air
conditioning system size should be limited to 1.5 tons
(18,000 BtuH). When using 6" (152 mm) diameter duct,
air conditioners of up to 2 tons (24,000 BtuH) may be
used. Total static pressure of the system above the out­let from the fireplace cabinet should not exceed 0.40"
w.c. with the air circulating blower on high speed, when
using the maximum air conditioning capacity.

Two rails come factory mounted in the coil cabinet.
These represent the minimum clearance between the
evaporator coil and the fireplace cabinet top. Do not
mount an evaporator coil below the level of the rails.

Final Finishing

Noncombustible materials such as brick and tile can
be extended over the front face of the unit (Do not
cover louvres or glass door). If a trim kit is going to
be installed, brick and tile will have to be installed flush
with the side of this appliance.

Hearth

A hearth is not mandatory, however it is recommended
for aesthetic purposes. We recommend a noncombus­tible hearth which projects out 12" (305 mm) or more in
front of this unit.

Cold climate installation recommendation:
When installing this unit against a non­insulated exterior wall or chase, it is
mandatory the outer walls be insulated to
conform to applicable insulation codes.

DVHVAC36

Certified to

ANSI Z21.88-2005 / CSA 2.33-2005

Vented Gas Fireplace Heaters

Unit: B12AC0, B12BC0

Do not use this fireplace if any part of it
has been under water. Immediately call a
qualified service technician to inspect the
fireplace and replace any part of the control
which has been under water.

Gas Inlet & Manifold Pressures

Supply Pressure Natural LP (Propane)
Minimum 5.5" w.c. 11.0" w.c.
Maximum 14.0" w.c. 14.0" w.c.
Manifold Pressure 3.5" w.c. 10.0" w.c.

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,
installations 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 jurisdiction for installations at
elevations above 4,500 feet (1,370 m).

Rails

Ref. Dimension
A 21" (534 mm)
B 17
C 3
D 20
E 8

Fig. 6 Coil cabinet dimensions.

10001195

⁷⁄₁₇" (443 mm)

⁷⁄₁₆" (88 mm)

⁷⁄₁₆" (519 mm)

¹⁄₂" (217 mm)

FP1401

Gas Specifications

Max. Min.

Input Input
Model Fuel Gas Control BTUH BTUH

DVHVAC36RN Natural Gas Millivolt HI/LO 40,000 25,000

DVHVAC36RP Propane Gas Millivolt HI/LO 40,000 25,000

Gas Line Installation

When purging gas line, the front glass
must be removed.

The gas pipeline can be brought in through the right
side or left side of the appliance as well as the bottom.
Knockouts are provided at convenient locations to allow
for the gas pipe installation and testing of any gas con­nection.

The gas line connection can be made with properly
tinned 3/8" copper tubing, 3/8" rigid pipe or an approved
flex connector.

Always check for gas leaks with a mild
soap and water solution. Do not use an
open flame for leak testing.

7

DVHVAC36

The gas control is equipped with a captured screw type
pressure test point, therefore it is not necessary to pro­vide a 1/8" test point up stream of the control.

When using copper or flex connector use only approved
fittings. When using black iron pipe always provide a
union so the gas line can be easily disconnected for
burner or fan servicing. (Fig. 7) Refer to gas specifica­tions for pressure details and ratings.

The fireplace valve must not be subjected to any test
pressures exceeding 1/2 psi. Isolate or disconnect this
or any other gas appliance control from the gas line
when pressure testing.

1/2" Gas Supply

1/2" NPT x 1/2" Flare
Shut-off Valve

3/8" Flex Line
(From Valve)

FP297a

Fig. 7 Typical gas supply installation.

Electrical Specifications

120V AC
60Hz
Less than 12 Amps
1/3 Horsepower

8

10001195

Electrical

1 2 3 4 5 6

COMMON

NOT USED

MED-HI

MED-LO

LOW

NOT USED

ACB

FLAME
ADJUST

ORANGE/BLACK

BROWN

ORANGE

HUMIDIFIER

ACB HEAT

ACB COOL

AIR CLEANER

XFORMER

1

2 RED

3 BLACK

1 WHITE

110 VAC HOT

110 VAC RTN

110 VAC HOT

CLEAN RTN

HUMID RTN

10 VAC RTN

ACB RTN

X FORMER

2

SOLENOID

2

SOLENOID

1

9 YELLOW

6 BLACK

7 WHITE

8 BLUE

8 BLUE

3

5

1

4

THERMOSTAT

11 GREEN

10 BLUE

R

W1

G

Y

GND

CHASSIS GND

24 VAC RTN

24 VAC HOT

TH TP-PILE

+

TH-PILE

+

THERMOPILE

GAS VALVE

TP/TH

TP TH

EMERGENCY
HEAT
SWITCH

14 YELLOW

15 BLUE

13 BLUE

12 YELLOW

RED

WHITE

L1

L2

TP/TH

TH

LIMIT

16 YELLOW

17 GREEN

TP

4 RED

5 WHITE

18 GRAY

19 YELLOW

20 GREEN

GREEN

Refer to Figure 8 for field wiring.

1. Select fuse and wire size according to rating plate
amperage.

2. Install a separate fused disconnect switch near the
unit for service purposes.

3. Knockouts are provided on both sides of cabinet for
electrical wiring.

4. Install room thermostat (24 volt) according to
instructions provided with thermostat, using 18
gauge wire or larger.

DVHVAC36

5. Electrically ground the unit in accordance with
local codes, or in the absence of local codes in
accordance with the Canadian Electrical Code, Part
1 (CSA Standard C22.1) in Canada, or with the
National Electric Code (ANSI/NFPA No. 70) in the
United States.

6. The circuit board is equipped with two (2) accessory
terminals. The terminal marked "Air Cleaner" and
"Humidifier" are rated for 120V 0.5 Amps and are
energized with the air circulating blower. Connect the
neutral leg of the accessory to the 120V neutral wire.

General Venting

Fig. 8 DVHVAC36 wiring diagram.

This model is approved to be vented either through the
side wall, or vertically through the roof.

• Only venting components specifically approved and

labelled for this fireplace may be used.

• Minimum clearances between vent pipes and com-

bustible materials is 1" (25 mm).

• Venting terminals shall not be recessed into a wall or

siding.

• Horizontal venting must be installed on a level plane

without an inclining or declining slope.

There must not be any obstruction such as bushes,
garden sheds, fences, decks or utility buildings within

10001195

24" (610 mm) from the front of the termination hood.
Do not locate termination hood where excessive snow

or ice build up may occur. Be sure to check vent termi­nation area after snow falls, and clear to prevent ac­cidental blockage of venting system. When using snow
blowers, make sure snow is not directed towards vent
termination area.

Location of Vent Termination

It is imperative that the vent termination be located ob­serving the minimum clearances as shown on Page 10.

*Check with local codes or in absence of same with
CSA B149.1 Installation Codes (1991) for Canada or for
U.S.A. Installations follow the current National Fuel Gas
Code, ANSI Z223.1/NFPA 54.

FP1413

9

DVHVAC36

V

V

V

V

V

V

V

X

X

X

D

E

B

B

B

C

B

M

B

A

J

K

F

L

VENT TERMINATION AIR SUPPLY INLET

AREA WHERE TERMINAL IS NOT PERMITTED

H

I





Operable

Operable

Fixed

Closed

V

B

INSIDE

CORNER DETAIL

V

A

G

N

N

CFM145a

General Venting Information - Termination Location

Canadian Installations1 US Installations

2

A = Clearance above grade, veranda, porch, 12” (30cm) 12” (30cm)
deck, or balcony

B = Clearance to window or door that may be 6” (15cm) for appliances 6” (15cm) for appliances
opened < 10,000Btuh (3kW), 12” (30cm) < 10,000 Btuh (3kW), 9”

for appliances > 10,000 Btuh (3kW) and (23cm) for appliances > 10,000
< 100,000 Btuh (30kW), 36” (91cm) Btuh (3kW) and < 50,000 Btuh
for appliances > 100,000 Btuh (30kW) (15kW), 12” (30cm) for
appliances > 50,000 Btuh (15kW)

C = Clearance to permanently closed window 12” (305mm) recommended to 12” (305mm) recommended to
prevent window condensation prevent window condensation

D = Vertical clearance to ventilated soffit located
above the terminal within a horizontal 18” (458mm) 18” (458mm)
distance of 2 feet (610mm) from the center
line of the terminal

E = Clearance to unventilated soffit 12” (305mm) 12” (305mm)
F = Clearance to outside corner see next page see next page
G = Clearance to inside corner (see next page) see next page see next page
H = Clearance to each inside of center line 3’ (91cm) within a height of 15’ 3’ (91cm) within a height of 15’

extended above meter/regulator assembly above the meter/regulator assembly above the meter/regulator assy
I = Clearance to service regulator vent outlet 3’ (91cm) 3’ (91cm)
J = Clearance to nonmechanical air supply inlet 6” (15cm) for appliances < 10,000 6” (15cm) for appliances

to building or the combustion air inlet to any Btuh (3kW), 12” (30cm) for < 10,000 Btuh (3kW), 9”
other appliances appliances > 10,000 Btuh (3kW) and < (23cm) for appliances > 10,000
100,000 Btuh (30kW), 36” (91cm) Btuh (3kW) and < 50,000 Btuh
for appliances > 100,000 Btuh (30kW) (15kW), 12” (30cm) for
appliances > 50,000 Btuh (15kW)

K = Clearance to a mechanical air supply inlet 6’ (1.83m) 3’ (91cm) above if within 10’
(3m) horizontally

L = Clearance above paved sidewalk or paved 7’ (2.13m)† 7’ (2.13m)†
driveway located on public property

M = Clearance under veranda, porch, deck or 12” (30cm)‡ 12” (30cm)‡
balcony

N = Clearance above a roof shall extend a minimum of 24” (610mm) above the highest point when it passes through the roof
surface, and any other obstruction within a horizontal distance of 18” (450mm).

1 In accordance with the current CSA-B149 Installation Codes
2 In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Codes
† 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 2 sides beneath the floor:
NOTE: 1. Local codes or regulations may require different clearances.

2. The special venting system used on Direct Vent fireplaces are certified as part of the appliance, with clearances tested and app­ roved by the listing agency.

3. CFM Corporation assumes no responsibility for the improper performance of the appliance when the venting system does not
meet these requirements.

Fig. 9 Termination clearances.

10

10001195