Vermont Casting 20DVT User Manual
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.
Brookhaven
Direct Vent Model:
20DVT
Installation Instructions and
Homeowner’s Manual
DO NOT STORE OR USE
GASOLINE OR OTHER
FLAMMABLE VAPORS AND
LIQUIDS IN THE VICINITY OF
THIS OR ANY OTHER
APPLIANCE.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
10009459 2/07 Rev. 5
Brookhaven Direct Vent Gas Fireplace
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 fully may result in a possible fire hazard and will void the warranty.
Installation & Operating Instructions
Important Curing/Burning Instructions .................................................................................3
Locating Your Fireplace .......................................................................................................3
Fireplace Dimensions ..........................................................................................................4
Clearance to Combustibles ................................................................................................. 5
Mantels ...............................................................................................................................5
Hearth ...............................................................................................................................5
Framing and Finishing ......................................................................................................... 6
Final Finishing ..................................................................................................................... 6
Gas Specifications ...............................................................................................................6
Gas Inlet and Manifold Pressures ....................................................................................... 6
High Elevations ...................................................................................................................6
Gas Line Installation ............................................................................................................ 6
General Venting Information
General Venting ...................................................................................................................7
General Venting Information-Termination Location .............................................................8
General Information Assembling Vent Pipes ....................................................................... 9
Flex Vent Pipes ...................................................................................................................9
Twist Lock Pipes ................................................................................................................10
How to Use the Vent Graph ...............................................................................................10
Vertical Sidewall Applications & Installation ...................................................................... 10
Below Grade Installation ...................................................................................................13
Vertical Through-the-Roof Applications & Installation ...................................................... 14
Venting Components ......................................................................................................... 16
Operating Instructions
Glass Information ..............................................................................................................17
Cast Front Removal .........................................................................................................17
Window Frame Assembly Removal ...................................................................................17
Glass Cleaning ..................................................................................................................17
Installation of Logs and Lava Rock ...................................................................................18
Flame & Temperature Adjustment ..................................................................................... 19
Flame Characteristics ........................................................................................................19
Inspecting the Venting System .......................................................................................... 19
Lighting and Operating Instructions ...................................................................................20
Troubleshooting .................................................................................................................21
Fuel Conversion Instructions ............................................................................................. 22
Maintenance
Cleaning the Standing Pilot Control System .....................................................................24
Replacement Parts .....................................................................................................................25
Optional Accessories
Remote Controls ...............................................................................................................27
Ceramic Refractory Panels ...............................................................................................27
Warranty ....................................................................................................................................... 31
Energuide ..................................................................................................................................... 32
2
10009459
Brookhaven Direct Vent Gas Fireplace
Y
E
A
B
C
D
F
Y
X
Installation & Operating Instructions
This gas appliance should be installed by a qualified
installer in accordance with local building codes and with
current CSA-B149.1 Installation codes for Gas Burning
Appliances and Equipment. For USA 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 high
surface temperatures of this fireplace and should stay away
to avoid burns or ignition of clothing.
3. CAUTION: Due to high glass surface temperature chil-
dren should be carefully supervised when in the same
room as fireplace.
4. Under no circumstances should this fireplace be modified.
Parts removed for servicing should be replaced prior to
operating this fireplace again.
5. Installation and any repairs to this fireplace must be per
formed by a qualified installer, service agency or gas supplier. A professional 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 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 combustible
materials, gasoline and other flammable vapor and liquids.
This fireplace should not be used as a drying rack for cloth
ing, nor should Christmas stockings or decorations be hung
on or around the fireplace.
9. Under no circumstances should any solid fuels (wood, coal,
paper or cardboard etc.) be used in this fireplace.
10. The flow of combustion and ventilation air must not be obstructed in any way.
11. When fireplace is installed directly on carpeting, vinyl tile
or any combustible material other than wood, the 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. This fireplace must not be connected to a chimney flue
serving a separate solid fuel burning fireplace.
14. When the fireplace is not in use it is recommended that the
gas valve be left in the OFF position.
WARNING: Check with your electronics manufacturer
before installing a television or other electronic device above this fireplace.
10009459 3
-
This appliance may be installed in an aftermarket permanently located, manufactured home or 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.
IMPORTANT:
PLEASE REVIEW THE FOLLOWING CAREFULLY
Remove any plastic from trim parts before turning the
fireplace ON.
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 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. If the optional
fan kit has been installed, place the fan switch in the
“OFF” position during this time.
Locating Your Fireplace
-
LU584-R
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’ (610 cm). See details in Venting Section.
* When you install your fireplace in(D) Room divider or (E) Flat
on wall corner positions (Y), a minimum of 6” (153 mm) clearance must be maintained from the perpendicular wall and the
front side edge of the fireplace.
Refer to (Y) in Figure 1.
Brookhaven Direct Vent Gas Fireplace
O - Rough Opening Width
K
F
Q
Rough
Opening Depth
E
5/8” (16 mm)
L
L
N
M
J
P
Rough
Opening
Height
D
C
A
B
G
I
H
Gas Line
Access
Electrical Access
No drywall in this area.
Must use noncombustible
wall board such as DuraRock.
20DVT Fireplace Dimensions
Fig. 2 Fireplace specifications and framing dimensions.
Ref. 20DVT
A 20” (508 mm)
B 29
C 13
D 19
E 14
F 15” (381 mm)
G 1
H 4
I 6
J 32
K 8” (203 mm)
L 31
M 44
N 23
O 21
¹⁄₂” (749 mm)
¹⁄₂” (343 mm)
³⁄₄” (502 mm)
³⁄₄” (375 mm)
¹⁄₂” (38 mm)
¹⁄₄” (108 mm)
³⁄₄” (171 mm)
¹⁄₂” (826 mm)
Framing Dimensions
³⁄₄” (806 mm)
⁷⁄₈” (1140 mm)
¹⁄₈” (587 mm)
¹⁄₄” (540 mm)
P 34” (864 mm)
Q 15
¹⁄₂” (394 mm)
4
10009459
Clearance to Combustibles
J
F
G
H
I
O
N
M
L
K
A B CDE
V
W
X
Y
Z
Fireplace
Top of Unit to Ceiling ................................32” (813 mm)
Front of Unit to Combustibles ...................36” (914 mm)
Appliance
Top of Standoff .........................................0” (0 mm)
Bottom ......................................................0” (0 mm)
Side .....................................................3/4” (19 mm)
Back .........................................................0” (0 mm)
Venting
Concentric sections of DV Vent ....................1” (25 mm)
Nonconcentric sections of DV Vent
Sides and Bottom ...................................1” (25 mm)
Top .........................................................2” (51 mm)
Mantels
The height that a combustible mantel is fitted above the
fireplace is dependent on the depth of the mantel. This
also applies to the distance between the mantel leg (if
fitted) and the fireplace.
For the correct mounting height and widths refer to
Figs. 3a and 3b, and the following Mantel Charts.
The fitting of a bay window trim kit does not effect
the distances and reference points referred to in the
diagram and chart.
Noncombustible mantels and legs may be installed
at any height and width around the appliance. When
using paint or lacquer to finish the mantel, such paint or
lacquer must be heat resistant to prevent discoloration.
Brookhaven Direct Vent Gas Fireplace
CFM164b
Side of Fireplace
Combustion
Opening
CFM170
Mantel Mantel Leg From Side
Ref. Leg Depth Ref. of Comb. Opening
F 12 (305 mm) K 12” (305 mm)
G 9” (229 mm) L 9” (229 mm)
H 6” (152 mm) M 6” (152 mm)
I 4” (102 mm) N 4” (102 mm)
J 3” (76 mm) O 3” (76 mm)
Mantel Shelf Mantel from Top of
Ref. or Breast Plate Ref. Combustion Chamber
Depth 20DVT
V 10” (254 mm) A 18
W 8” (203 mm) B 16
X 6” (152 mm) C 14¹⁄₂” (368 mm)
Y 4” (101 mm) D 12¹⁄₂” (318 mm)
Z 2” (51 mm) E 10
Fig. 3a Combustible mantel minimum installation.
10009459 5
Fireplace
Front
Mantel Chart
Maintain minimum 2¹⁄₂”
(64 mm) clearance to
combustible
Top of Combustion
Chamber
¹⁄₂” (470 mm)
¹⁄₂” (419 mm)
¹⁄₂” (267 mm)
CFM146
Fig. 3b Combustible mantel leg minimum installation.
Hearth
A hearth is not mandatory but is recommended for
aesthetic purposes. We recommend a noncombustible
hearth which projects out 12” (305 mm) or more from
the front of the fireplace.
Cold climate installation recommendation:
When installing this unit against a
non-insulated exterior wall or chase,
it is mandatory that the outer walls
be insulated to conform to applicable
insulation codes.
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
Brookhaven Direct Vent Gas Fireplace
A
B
Framing and Finishing
Check fireplace to make sure it is levelled
and properly positioned.
To mount the appliance:
1. Choose the location.
2. This unit comes with four (4) flanges pre-mounted
on both sides of the fireplace to allow two different
drywall thicknesses to be used. Flange “A” is for
1/2” drywall while flange “B” is for 5/8” drywall.
3. Bend the desired flanges out 90° on both sides of
the fireplace. Slide the fireplace into the framed
opening until the flanges contact the front surfaces
of the framing. Level the unit and secure it firmly in
place.
Flange Drywall
Position Depth
A 1/2” / 13 mm
B 5/8” / 16 mm
Flange Location for
Desired Drywall Depth
Gas Specifications
Max. Min. Air
Input Input Shutter
Model Fuel Gas Control BTU/h BTU/h Setting
Sides &
20DVTRN Nat. Millivolt Hi/Lo 13,000 8,700 Bottom
Half Open
Sides &
20DVTRP Prop. Millivolt Hi/Lo 13,000 8,700 Bottom
Half Open
Gas Inlet and Manifold Pressures
Natural LP (Propane)
Inlet Minimum 5.5” w.c. 11.0” w.c.
Inlet 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 (1,370m) above sea level.
For elevations above 4,500 feet (1,370m) 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 (1,370m).
Gas Line Installation
FP1539
Fig. 4 Nailing flanges.
Final Finishing
Noncombustible materials such as brick or tile may be
extended over the edges of the face of the fireplace.
DO NOT cover any vent or grille panels.
If a Trim Kit is going to be installed on the fireplace, the
brick or tile will have to be installed flush with the edges
of the fireplace.
The gas pipeline can be brought in through the rear
of the appliance as well as the bottom. Knockouts are
provided on the bottom behind the valve to allow for the
gas pipe installation and testing of any gas connection.
It is most convenient to bring the gas line in from the
rear right side of the valve as this allows fan installation
or removal without disconnecting the gas line.
The gas line connection can be made with properly
tinned 3/8” copper tubing, 3/8” rigid pipe or an ap-
20DVT
Certified To
ANSI Z21.88-2005 / CSA 2.33-2005
Vented Gas Fireplace Heaters
Unit: GFDN4B0
proved flex connector. Since some municipalities have
additional local codes, it is always best to consult your
local authority and the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 in the USA or the CSA-B149.1 installation code.
6
When purging the gas lines, the front window frame assembly must be removed.
Always check for gas leaks with a mild soap
and water solution applied with a brush no
larger than 1” (25 mm). Never apply soap
and water solution with a spray bottle. Do
not use an open flame for leak testing.
10009459
Brookhaven Direct Vent Gas Fireplace
TPTH
TH
TP
1/2” Gas Supply
1/2” NPT x 1/2” Flare Shutoff Valve
3/8” Flex Line
(From Valve)
FP297A
Fig. 5 Typical gas supply installation.
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 form the gas line when
pressure testing.
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. Always provide a union when using black iron
pipe so the gas line can be easily disconnected for
burner or fan servicing. See gas specification for pressure details and ratings.
The fireplace valve must not be subjected to any test
pressures exceeding 1/2 psi. Isolate or disconnect this
and any other gas appliance control from the gas line
when pressure testing.
Remote ON/OFF Switch
Do not wire the remote ON/OFF wall switch for this gas
appliance into a 120v power supply.
1. Thread wire through the electrical knockout located
on either side of the unit. Take care not to cut the
wire or insulation on metal edges. Ensure the wire is
secured and protected form possible damage. Run
one end of the gas control valve and the other end to
the conveniently located wall switch.
2. Attach the wire to the ON/OFF switch and install
switch into receptacle box. Attach cover plate to
switch.
3. Connect wiring to gas valve. (Fig. 6)
Remote ON/OFF Switch
FP1218
Fig. 6 Remote switch wiring diagram for R models.
General Venting
Your fireplace is approved to be vented either through
the side wall, or vertically through the roof.
• Only CFM Corporation venting components specifi-
cally approved and labelled for this fireplace may be
used.
• If vent termination is installed in an accessible loca-
tion, Vent Termination Guard #53525 shall be installed.
• Vent terminations shall not be recessed into a wall or
siding.
• Horizontal venting which incorporates the twist lock
pipe must be installed on a level plane without an
inclining or declining slope.
• Horizontal venting which incorporates the use of flex
venting shall have an inclining slope from the unit of
1/2” (13 mm) per 12” (305 mm).
10009459 7
There must not be any obstruction such as bushes,
garden sheds, fences, decks or utility buildings within
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 the vent termination be located observing the minimum clearances as shown on the next
page.
*Check with local codes or in absence of same with
CSA B149.1 Installation Codes (1991) for Canada
or follow the current National Fuel Gas Code, ANSI
Z223.1/NFPA 54 for installations in the USA.
Brookhaven Direct Vent Gas Fireplace
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’ (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’ (5m) 3’ (91cm) within a height of 15’
extended above meter/regulator assembly above the meter/regulator assembly (5m) 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
feet (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
approved 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. 7 Termination location requirements.
8
10009459
Outside Corner
Inside Corner
Termination Clearances
Termination clearances for buildings with combustible and noncombustible exteriors.
G =
Combustible
6" (152 mm)
Noncombustible
2" (51 mm)
F =
Combustible
6" (152 mm)
Noncombustible
2" (51 mm)
G
Balcony with no side wall
M =
Combustible &
Noncombustible
12" (305 mm)
M
Balcony with perpendicular side wall
M = 24" (610 mm)
P = 20” (508 mm)
M
F
Alcove Applications*
C
D
C
E
V
V
Combustible &
Noncombustible
V
V
V
E = Min. 6” (152 mm) for
non-vinyl sidewalls
Min. 12” (305 mm) for
vinyl sidewalls
O = 8’ (2.4 m) Min.
O
P
*NOTE: Termination in an alcove space (spaces open only on one side and with an overhang) is permitted with the dimensions
specified for vinyl or non-vinyl siding and soffits. 1. There must be a 3’ (914 mm) minimum between termination caps. 2. All
mechanical air intakes within 10’ (1 m) of a termination cap must be a minimum of 3’ (914 mm) below the termination cap. 3. All
gravity air intakes within 3’ (914 mm) of a termination cap must be a minimum of 1’ (305 mm) below the termination cap.
Fig. 7a Termination clearances.
Canadian Installations:
General Information Assembling Vent Pipes
Venting system must be installed in accordance with the
current CSA-B149.1 installation code.
USA Installations:
The venting system must conform with local codes and/
or the current National Fuel Gas code ANSI Z223.1/
NFPA 54.
Only venting components manufactured by CFM Corporation can be used in Direct Vent systems.
Brookhaven Direct Vent Gas Fireplace
No.
of Caps D
1 3’ (.9 mm) 2 x D
2 6’ (1.8 m) 1 x D
3 9’ (2.7 m) 2/3 x D
4 12’ (3.7 m) 1/2 x D
D
= # of Termination caps x 3
Min.
C
= (2 / # termination caps) x D
Max.
* Be sure the flex vent is flat and flush with the flue or
outer collar before proceeding. Apply a tug to be sure
the vent will not slip off the collars.
Repeat process with 7” flex vent pipe. The same proce
dure must be performed on the vent side.
C
Min.
Max.
Actual
Actual
Actual
Actual
Actual
584-15
-
Before joining the flex vent pipe to the unit, apply a
bead of high temperature sealant* (provided) to the 4”
pipe exiting the fireplace. Secure flex vent piep in place
with a hose clamp (provided).
*Be sure the flex pipe overlaps at least 1” (25 mm) onto
the collars of the fireplace and termination. If the termination has an internal bead, be sure to overlap and
secure 1” (25 mm) past the bead.
10009459 9
Flex Vent Pipes
Hose
Clamp
Apply High Temperature Sealant
Fig. 8 Apply high temperature sealant to 4” and 7” pipes.
FP1471a
Brookhaven Direct Vent Gas Fireplace
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
eg: A
eg: B
Twist Lock Pipes
When using CFM Corporation twist-lock pipe it is not
necessary to use sealant on the joints. The only areas
of the venting system that need to be sealed with high
temperature silicone sealant are the sliding joints of any
telescopic vent section used in the system.
To join the twist lock pipes together, simply align the
beads of the male end with the grooves of the female
end, then while bringing the pipe together, twist the pipe
until the flange on the female end contacts the external
flange on the male end. It is recommended that you
secure the joints with three (3) sheet metal screws,
however this is not mandatory with twist lock pipe.
To make it easier to assemble the joints we suggest
putting a lubricant (Vaseline or similar) on the male end
of the twist lock pipe prior to assembly.
Male End Female End
Vertical dimension from the floor of the unit
to the center of the horizontal vent pipe
Screw Holes
Fig. 9 Twist-lock pipe joints.
TWL100
Horizontal dimension from the outside face of the
wall to the center of the fireplace vent flange
How to Use the Vent Graph
The vent chart should be read in conjunction with the
following vent installation instructions to determine the
relationship of the vertical and horizontal dimensions of
the vent system.
1. Determine the height of the center of the horizontal
vent pipe exiting through the outer wall. Using this
dimension on the Sidewall Vent Graph (Fig. 10)
locate the point intersecting with slanted graph line.
2. From the point of this intersection, draw a vertical
line to the bottom of the graph.
3. Select the indicated dimension, and position the
fireplace in accordance with same.
Example A:
If the vertical dimension from the floor of the
fireplace is 11’ (3.4 m) the horizontal run to the face
of the outer wall must not exceed 14’ (4.3 m).
Example B:
If the vertical dimension from the floor of the unit is
7’ (2.14 m), the horizontal run to the face of the outer
wall must not exceed 8¹⁄₂’ (2.6 m).
10
Sidewall vent graph showing the relationship between vertical
and horizontal dimensions for a Direct Vent flue system.
Fig. 10 Sidewall venting graph. (Dimensions in feet)
Vertical Sidewall Applications
Since it is very important that the venting system
maintain its balance between the combustion air
intake and the flue gas exhaust, certain limitations
as to vent configurations apply and must be strictly
adhered to.
The Vent Graph shows the relationship between vertical
and horizontal side wall venting and will help to determine the various dimensions allowable.
Minimum clearance between vent pipes and combustible materials is 1”(25 mm) on top, bottom and
sides unless otherwise noted.
When vent termination exits through foundations less
than 20” below siding outcrop, the vent pipe must
flush up with the siding. It is always best to locate the
fireplace in such a way that minimizes the number of
offsets and horizontal vent length.
The horizontal vent run refers to the total length of vent
pipe from the flue collar of the fireplace to the face of
the outer wall.
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