Desa VM36P, VM42PB, M42P, VM42B, M36P User Manual
For more information, visit www.desatech.com
B-VENT DECORATIVE GAS FIREPLACE
OWNER’S OPERATION AND INSTALLATION MANUAL
MODELS M36(B,H), M42(B,H), VM36(B,H) AND VM42(B,H) NATURAL GAS
MODELS M36P(B,H), M42P(B,H), VM36P(B,H) AND VM42P(B,H) PROPANE/LP GAS
WARNING: If the information in these instructions
is not followed exactly, a fire or explosion may re
sult causing property damage, personal injury or
death.
FOR YOUR SAFETY
— Do not store or use gasoline or any other flam
mable vapors or 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.
SAVE THIS BOOK
This book is valuable. In addition to instructing you
on how to install and maintain your appliance, it
also contains information that will enable you to
obtain replacement parts or optional accessory
items when needed. Keep it with your other important papers.
WARNING: Improper installation, adjustment, alteration, service or maintenance
can cause injury or property damage.
Refer to this manual. For assistance or
additional information consult a quali
fied installer, service agency or the gas
supplier.
NOT FOR USE WITH SOLID FUEL
CHECK LOCAL CODES PRIOR TO
INSTALLATION
MASSACHUSETTS STATE CODE RE
QUIRES THE VENT DAMPER TO BE
WELDED OPEN OR REMOVED.
-
-
This appliance may be installed in an aftermarket*, permanently located, manufactured (mobile) home, where not
prohibited by state or 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.
*Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer.
Save this manual for future reference.
2
TABLE OF CONTENTS
Safety Information ........................................................................2
Unpacking ....................................................................................3
Introduction ................................................................................... 3
Product Specifications ..................................................................
Selecting Location ........................................................................ 5
Pre-Installation Preparation ..........................................................5
Venting Installation .......................................................................
Installation ..................................................................................10
Operating Fireplace ....................................................................16
Inspecting Burners ....................................................................17
Cleaning and Maintenance ......................................................... 18
Wiring Diagram ........................................................................... 18
Service Hints ..............................................................................18
4
Technical Service .......................................................................
Replacement Parts .....................................................................18
Troubleshooting ..........................................................................
8
Illustrated Parts Breakdown and Parts List ................................22
Accessories ................................................................................ 27
Warranty Information ...................................................
18
19
Back Cover
SAFETY INFORMATION
WARNING: This product contains and/or generates
chemicals known to the State of California to cause
cancer or birth defects or other reproductive harm.
IMPORTANT: Read this owner’s manual carefully and
completely before trying to assemble, operate or service
this fireplace. Improper use of this fireplace can cause
serious injury or death from burns, fire, explosions,
electrical shock and carbon monoxide poisoning.
DANGER: Carbon monoxide poisoning may lead
to death!
This fireplace is a vented product. This fireplace will not produce
any gas leakage into your home if properly installed. This fireplace
must be properly installed by a qualified service person. If this unit
is not properly installed by a qualified service person, gas leakage
can occur.
Carbon Monoxide Poisoning: Early signs of carbon monoxide
poisoning resemble the flu, with headaches, dizziness or nausea.
If you have these signs, the fireplace may not have been installed
properly. Get fresh air at once! Have fireplace inspected and ser-
viced 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.
WARNING: Any change to this fireplace or its con-
trols can be dangerous.
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 pro
pane/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 neighborʼs phone.
Follow the gas supplier's instructions
• if you cannot reach you gas supplier, call the fire department.
4. Never install the fireplace
• in a recreational vehicle
• where curtains, furniture, clothing or other flammable
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 from hot surfaces to avoid burns or clothing igni
tion. 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. A hearth extension is not required with this appliance. If one
is installed, it is for aesthetic purposes only and does not have
to meet the standard requirements.
8. Turn fireplace off and let cool before servicing or repairing.
Only a qualified service person should install, service or repair
this fireplace. Have fireplace inspected annually by a qualified
service person.
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3
3
SAFETY INFORMATION
Continued
9. You must keep control compartments, burners and circulating
air passages clean. More frequent cleaning may be needed due
to excessive lint and dust from carpeting, bedding material, 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. See
Cleaning and Maintenance, page 18.
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. Do not use any solid fuels (wood, coal, paper, cardboard, etc.)
in this fireplace. Use only the gas type indicated on fireplace
nameplate.
14. This appliance, when installed, must be electrically grounded
in accordance with local codes or, in the absence of local
codes, with the National Electrical Code, ANSI/NFPA 70 or
the Canadian Electrical Code, CSA C22.1.
15. 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.
16. Do not install fireplace directly on carpeting, vinyl tile or any
combustible material other than wood. The fireplace must set
on a metal or wood panel extending the full width and depth
of the fireplace.
17. Do not use fireplace if any part has been exposed to or under
water. Immediately call a qualified service person to arrange
for replacement of the unit.
18. Do not operate fireplace if any log is broken.
19. Do not use a blower insert, heat exchanger insert or other accessory not approved for use with this fireplace.
20. Provide adequate clearances around air openings.
UNPACKING
The following items are packed inside the firebox. Remove before
positioning firebox into framing.
• Transition Collar - For vent connection
• Ceramic Log Pack - Shrink-wrapped on cardboard
• Three (3) plastic bags containing lava rock, pan and ember ma-
terials
• Rear Log - Remove the two plastic quick ties from around the
burner and grate
• Grate Stand - Lift off of burner pan
Check all items for any shipping damage. If damaged, promptly
inform dealer or distributor where you bought the product.
Safely retain these items for later installation.
INTRODUCTION
Models M36 (P)(B,H), VM36(P)(B,H), M42(P)(B,H) and
VM42(P)(B,H) are vented gas fireplaces that use a millivolt gas
control valve with a millivolt ignition system. A 6" B-Type venting
system and a listed type vent cap are not supplied but are required
for proper operation. See venting instructions on pages 9 and 10.
WARNING: This gas appliance must not be connected to a chimney flue servicing a solid fuel burning
appliance.
Models M36(B,H), VM36(B,H), M42(B,H) and VM42(B,H) are
factory equipped for use with natural gas and must be converted
when intended for use with propane/LP gas. A respective model
PCBM-36 or PCBM-42 conversion kit may be purchased for simple
conversion to propane/LP gas. See Accessories, page 27.
BEFORE YOU BEGIN
Before beginning the installation of your appliance, read these
instructions through completely.
This DESA appliance and its approved components are safe when
installed according to this installation manual and are operated as
recommended by DESA. Unless you use DESA approved components tested for this appliance, YOU MAY CAUSE A FIRE
HAZARD!
The DESA warranty will be voided by and DESA disclaims any
responsibility for the following actions :
A) Modification of the appliance or any of the components.
B) Use of any component part not approved by DESA in combina-
tion with this appliance.
C) Installation and/or operation in a manner other than instructed
in this manual.
D) The burning of anything other than the type of gas approved
for use in this gas appliance.
The installation must conform with local codes or, in the absence
of local codes, with the current National Fuel Gas Code, ANSI
Z223.1/NFPA 54 or with the current CAN/CGA B149 Installation
Codes.
This appliance complies with ANSI Z21.50-2000 and CSA 2.22-2000
as Vented Gas Fireplaces and is listed and tested by the Canadian
Standards Association to the above test standards.
WARNING: Installation of this appliance should be
done by a qualified service person well trained in the
installation of such appliances. You will also need a
building permit from your local Building and Safety Commissioner before installing this appliance; otherwise
your insurance co. may not cover this appliance.
NOTICE: This appliance is not intended to be used as
a primary source of heat.
108795-01M
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4
S
T
P
Q
R
X
Outside Air
Kit Location
(Optional)
K
7"
J
I
M
L
V
13.5"
1.5"
Glass Door
(Optional)
W
O
N
Alternate
Gas Supply
Inlet
7"
G
H
F
A
Stand Off
Collar
For Use With
6"Ø Type B-1
Vent Pipe Only
B
E
D
C
DIMENSIONS
HEARTH AREA
7"
INTRODUCTION
Continued
CAUTION: Do not connect appliance before pressure
testing gas piping. Damage to gas valve may result and
an unsafe condition may be caused.
The appliance and itʼs individual shutoff valve must be disconnected
from the gas supply piping system during any pressure testing of
that system at test pressures in excess of 1/2 psig (3.5 kPa).
The appliance must be isolated from the gas supply piping system
by closing its individual manual shutoff valve during any pressure
testing of the gas supply piping system at test pressures equal to or
less than 1/2 psig (3.5 kPa).
For the purpose of input adjustment two pressure taps (for IN and
OUT pressures) are provided on the gas control valve for test gauge
connections to the appliance.
PRODUCT SPECIFICATIONS
GAS RATING - NATURAL
M36(B,H), VM36(B,H) M42(B,H), VM42(B,H)
Max. Input Rating: 40,000 Btu/Hr 45,000 Btu/Hr
Manifold Pressure: 3.5 in. WC (.87 kPa) 3.5 in. WC (.87 kPa)
Minimum Supply Pressure: 4.5 in. WC (1.12 kPa) 4.5 in. WC (1.12 kPa)
Maximum Supply Pressure: 10.5 in. WC (2.66 kPa) 10.5 in. WC (2.66 kPa)
Orifice Size: # 30 # 29
GAS RATING - PROPANE/LP
Max. Input Rating: 40,000 Btu/Hr 45,000 Btu/Hr
Manifold Pressure: 10 in. WC (2.49 kPa) 10 in. WC (2.49 kPa)
Minimum Supply Pressure: 11 in. WC (2.74 kPa) 11 in. WC (2.74 kPa)
Maximum Supply Pressure: 13 in. WC (3.23 kPa) 13 in. WC (3.23 kPa)
Orifice Size: # 52 # 50
M36P(B,H), VM36P(B,H)
M42P(B,H), VM42P(B,H)
Model 36 Model 42 Model 36 Model 42 Model 36 Model 42
A 29" 36" I 40
B 5/8" 5/8" J 21" 24" R 10
C 41" 48" K 8" 9" S 2
D 12" 14" L 34 3/4" 42" T 8 1/8" 8 1/8"
E 21
F 22
G 32
H 15
1
/4" 23" M 42" 49" U 11" 12 3/4"
1
/4" (24" w/o Brick) 29 1/4" (31" w/o Brick) N 36" 40" V 7" 7"
5
/8" (34" w/o Brick) 39 1/2" (41 1/4" w/o Brick) O 37" 41" W 2 1/4" 2 1/4"
3
/4" (16 3/4" w/o Brick) 17 3/4" (18 3/4" w/o Brick) P 8 5/8" 10 1/2" X 5" 4 1/2"
1
/4" 44 1/4" Q 13 7/8" 14"
1
/2" 12 1/2"
1
/2" 2 1/2"
Figure 1 - Appliance Dimensions
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108795-01M
5
0"
0" Clearance
*
*
**
42" (1067mm)
Min. Clearance
from Opening to
Ceiling
0" Clearance
Ceiling
1" (25mm) Min.
Clearance to
"B" Vent's Outer Pipe
Maintain 2" (51mm) Min.
Clearance to the Transition
Pipe as Measured at the
Outer Vent Collar
Required Air
Spaces are
Indicated with
an "
*
". Do Not
Pack with
Insulation or Any
Other Material
DO NOT BLOCK
OR OBSTRUCT
OPENINGS
0" Clearance to
Combustible or
Noncombustible
Flooring
INTERNAL WALL
INSTALLATION
CORNER
INSTALLATION
FULL
PROJECTION
INSTALLATION
FLUSH
INSTALLATION
5
SELECTING LOCATION
To determine the safest and most efficient location for your appliance, you must take into consideration the following guidelines:
1. The location must allow for proper clearances (see Clearances,
next column).
2. Consider a location where heat output would not be affected
by drafts, air conditioning ducts, windows or doors.
3. A location that avoids the cutting of joists or roof rafters will
make installation easier. Figure 2 shows a plan view of a few
common locations.
Flush installations are recommended where living space is
limited or at a premium and since the space required to enclose
the appliance would be located beyond an outside wall, this would
also reduce the cutting of joists, roof rafters and such. Check local
codes for any restrictions.
Projected installations can extend any distance into the room.
A projection may be ideal for a new addition on an existing, finished wall.
Corner installations make use of space that may not normally
be used and provides a wider and more efficient range for radiant
heat transference.
Internal wall installations provide a discreet option for room separation and can also be ideal as an addition to an existing wall.
PRE-INSTALLATION PREPARATION
CLEARANCES
Minimum clearances to combustibles are:
• Back and Sides of Outer Surround ..................... 0" min.
• Drywall to Sides of Front Face (Nailing Flanges) 0" min.
• “B” Vent Surfaces ..............................................
• Ceiling to Opening ...........................................
• Floor ................................................................... 0" min.
• Perpendicular Wall ........................ See Figure 6, page 7
CAUTION: Do not block required air spaces with
insulation or any other material. Do not obstruct ef
fective opening of appliance with any type of facing
material.
2 x 4 Stud
Nailing Flange
Back
Left Side
Surround
1" min.
42" min.
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108795-01M
Figure 2 - Possible Locations for Installing Appliance
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Front Face
Figure 3 - Minimum Clearances (Top View)
Figure 4 - Minimum Clearances (Front View)
Drywall
6
Spacer
3" (76mm)
1 1/2"
(38mm) Max.
B
6" (152mm)
A
12"
(229mm)
Combustible
Materials
Header
1 1/2" (38 mm)
Max.
3" (76 mm)
Max.
6" (152 mm)
Max.
A
B
Outer Surround
Combustible
Material May
Be Used
TOP
VIEW
SAFE
ZONE
Perpendicular
Wall
PRE-INSTALLATION
PREPARATION
Continued
MANTEL CLEARANCES AND WALL DETAILS
A combustible mantle shelf maybe installed a maximum 12"
(229 mm) from the wall. Figures 5 and 6 show the minimum
allowable distances from various combustible mantle compo
nents in relation to the fireplace opening.
-
M36(B,H), M36P(B,H) M42(B,H), M42P(B,H)
VM36(B,H), VM36P(B,H) VM42(B,H), VM42P(B,H)
A 14" (356 mm) 15" (381 mm)
B 8" (203 mm) 9" (229 mm)
Figure 5 - Mantel Clearances - Side View (Cross Section)
M36(B,H), M36P(B,H) M42(B,H), M42P(B,H)
VM36(B,H), VM36P(B,H) VM42(B,H), VM42P(B,H)
A 9" (229 mm) 6" (152 mm)
B 12" (305 mm) 9" (229 mm)
Figure 6 - Side Clearances - Top View (Cross Section)
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108795-01M
7
B
C
A
A
B
C
D
7
PRE-INSTALLATION
PREPARATION
Continued
FRAMING
1. Frame appliance enclosure as illustrated in Figures 7 and 8.
Note: If a wall covering is used to line the enclosure, then all
measurements must be from the surface of the covering.
2. Place the appliance into the framing and secure it.
Note: If appliance is to be raised above floor level, a platform
must be built to support the appliance.
3. Install the supply line to the appliance using a 1/2" NPT black
iron gas line terminating 2 5/16" above the bottom of the appliance. The gas line must be installed through the lower left
side access point or alternate access hole in the bottom of the
appliance (see Figure 19, page 11).
4. Repack insulation around the gas line to cover any remaining
openings in the conduit sleeve. Prepare the incoming gas line
with teflon tape or pipe joint compound and hook-up incoming
gas line to the flexible gas line.
Note: If 1/2" NPT black iron pipe does not mate with fitting
at the end of flexible gas line, remove fitting and replace with
a 37 degree flare 3/4"-12, 1/2" NPT (female) fitting.
WARNING: When finishing appliance, do not overlap
combustible material onto the black front face. Brick,
tile or other noncombustible materials may be applied
to the face provided that any gap is between the material used and the face is caulked with a noncombustible
caulking.
These Dimensions Allow for a 3/4"
Clearance at Sides and Back of
Fireplace. However, 0" Clearance
is Permitted
3/4" Clearance
Not Required
at Nailing
Flanges
M36(B,H), M36P(B,H) M42(B,H), M42P(B,H)
VM36(B,H), VM36P(B,H) VM42(B,H), VM42P(B,H)
A 24
B 73
C 52
D 17
1
/2" (622.3 mm) 27 9/16" (700.1 mm)
7
/8" (1876.4 mm) 83 7/8" (2130.4 mm)
3
/16" (1326 mm) 59 5/16" (1506.6 mm)
1
/4" (438.2 mm) 19 1/2" (495.3 mm)
Figure 8 - Corner Installation Guidelines
INSTALLING TRANSITION PIPE AND
STARTER COLLAR
The transition pipe and starter collar shown in Figure 9 are supplied
with the fireplace, unattached and ready for installation. Remove
the starter collar and set aside. Slide the transition pipe over the
vent collar and attach with a minimum of three screws. Replace the
starter collar over the transition pipe and attach using four screws
located on the leg stands (five used on the model M42). To install
B-vent piping, slide the first piece of B-vent over the transition pipe
and attach with either a minimum of two screws or other means
approved by the vent manufacturer.
M36(B,H), M36P(B,H) M42(B,H), M42P(B,H)
VM36(B,H), VM36P(B,H) VM42(B,H), VM42P(B,H)
A 40
B 21
C 41
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3
/8" (1020 mm) 44 3/8" (1121 mm)
3
/8" (543 mm) 23 1/8" (587 mm)
1
/4" (1048 mm) 48 1/4" (1226 mm)
Figure 7 - Rough Opening for Installing in Wall
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B-Vent Piping
Starter Collar
Transition Pipe
Vent Collar
Figure 9 - Installing Transition Pipe and Starter Collar
8
Maintain
Listed
Clearance
12' Min.
12' Min.
45
45
6'
8'
12' Min.
60
45
Position
Firestop
Position
Firestop
Position
Firestop
Listed
Ve
nt Cap
Listed
Vent Cap
Listed
Ve
nt Cap
Maintain
Listed
Clearance
Maintain
Listed
Clearance
Maintain
Listed
Clearance
Maintain
Listed
Clearance
Maintain
Listed
Clearance
Support Each
Lateral At
Least Every
Six (6) Feet
Maintain
Listed
Clearance
10'
EXAMPLE 3EXAMPLE 2EXAMPLE 1
VENTING INSTALLATION
A B-type venting system must be connected to the appliance for
venting to the outside of the building.
The following section is provided as a guide to a standard B-type
vent installation.
Standing codes requirements concerning B-type vent installations
may vary within your state, province or local codes jurisdiction.
Therefore, it is recommended that you check with your local building codes for specific requirements or in absence of local codes,
follow Section 7.0 of the current National Fuel Gas Code ANSI
Z223.1/NFPA 54 and in Canada with CAN/CGA B149 for Category
I systems using double wall B-1 vent pipe.
This gas appliance must be vented to the outdoors only and may not
be terminated into an attic space or into a chimney flue servicing a
solid-fuel burning appliance.
This appliance may be vented through a manufactured chimney
system or a masonry chimney using a B-vent adapter or a chimney
liner system if all are listed, inspected and approved by local codes
and/or building authorities.
The examples shown in Figure 10 are typical of most B-vent instal
lations and codes practices.
Example 1: Shows the minimum allowable system height and
lateral offset for a 60° degree or greater inclination. Code specifies
that offsets at 60° degrees or greater are considered horizontal and
must follow the 75% percent rule for lateral to total vertical system
height. Codes also allows only one offset in the total system when
at 60° degrees or greater. The total vertical height in this example
represents the minimum height of 8 feet and therefore the allowable
lateral is 6 feet when the 75% percent rule applies. If the lateral
length must exceed 75% then the system must be sized in accordance
with the Category I venting tables.
Example 2: Shows a multiple offset each at 45° degrees of inclination. Multiple offsets are permitted if they do not exceed 45° degrees
of inclination. The total lengths of the two offsets are not required
to meet the 75% percent allowable rule.
Example 3: Shows a single offset at 45° degrees of inclination
and therefore the lateral length at 10 feet of offset does not have to
meet the 75% percent rule.
In each case the offsets must be supported and firestops must be
positioned wherever the vent must pass through a sub-floor, ceiling
joist or an attic overhang. The vent pipe must terminate vertically
into a listed type vent cap and extend a sufficient height through
an approved roof flashing, roof jack or a roof thimble. At all points
the listed clearances must be maintained.
Figure 10 - Typical B-Vent Configuration
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108795-01M
9
Lowest
Discharge
Opening
Listed
Vent Cap
8 Ft. Min.
Roof Pitch x/12
Listed Clearance
12
x
Listed Gas
Vent
H (Min)
Height
From Roof
9
VENTING INSTALLATION
Continued
Vent terminations must be located in accordance with height and
proximity rules of NFPA No. 54 or CAN/CGA B149. These rules
apply to vents at 12 in. diameter or less and require a minimum
height in accordance with the roof pitch and a minimum of 8 ft.
distance from a vertical wall or obstruction (see Figure 11).
If venting horizontally through a side wall becomes necessary, a
listed thimble approved for use with B-type vent must be used. Check
with your local codes before venting through a side wall.
Some codes areas allow the use of existing B-type vent systems if
the system is at or above the recommended diameter of the flue;
in this case 6".
The flue connection must be made using listed B-type connectors
and the existing system must be code inspected for damage and
proper installation.
It is not recommended that this appliance be common vented with an
existing gas burning appliance. However, if it becomes necessary to
common vent this appliance, the venting system must be sized and
configured in accordance with the common venting guides Appendix
G of the current National Fuel Gas Code ANSI Z223.1/NFPA 54
and in Canada with CAN/CGA B149.
Note: Before connecting this appliance to an existing vent system
or a common venting system consult with your local architect,
planner or building official.
WARNING: This appliance must be properly connected to a system and must not be connected to a
chimney flue servicing a separate solid fuel burning
appliance.
CHECKING FOR PROPER VENTING
After completing and checking the electrical, gas and vent connections, follow the lighting instructions and allow the main burner to
run for approximately 5 minutes. Hold a lighted match or cigarette
near the top edge of the fireplace opening and play it along the entire
length of the opening (see Figure 12). Proper venting should tend
to draw the flame or smoke into the appliance. Improper venting
or escaping of spillage of burned gas, is indicated when the match
flickers or goes out. Smoke from a cigarette will also tend to disperse
away from the appliance.
If the appliance is found to be improperly venting, shut it off and
notify your installer or a qualified service agency to inspect the
venting system.
NOTICE: This appliance is equipped with a vent safety
shutoff switch which will shut down the appliance in
the case of a venting problem. Do not bypass the vent
safety switch. If the appliance should shut down, contact
a qualified installer, service agency or your gas supplier
to have the vent inspected before operating.
108795-01M
Check this area along
the entire top edge of the
fireplace opening. Smoke
or flame should be drawn
into the appliance opening.
Roof Pitch H (Min.) Ft. m
Flat to 6/12 1.0 0.30
6/12 to 7/12 1.25 0.38
Over 7/12 to 8/12 1.5 0.46
Over 8/12 to 9/12 2.0 0.61
Over 9/12 to 10/12 2.5 0.76
Over 10/12 to 11/12 3.25 0.99
Over 11/12 to 12/12 4.0 1.22
Over 12/12 to 14/12 5.0 1.52
Over 14/12 to 16/12 6.0 1.83
Over 16/12 to 18/12 7.0 2.13
Over 18/12 to 20/12 7.5 2.27
Over 20/12 to 21/12 8.0 2.44
Figure 11 - B-Vent Terminations
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Figure 12 - Checking for Spillage
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