Vermont Castings DVRT41 Mounting instructions

Homeowner's Installation and
Operating Manual
INSTALLER: DO NOT DISCARD THIS MANUAL - LEAVE FOR HOMEOWNER
Direct Vent
Model: DVRT41
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 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.
WARNING!
IF THE INFORMATION IN THIS
MANUAL IS NOT FOLLOWED
EXACTLY, A FIRE OR EXPLO-
SION MAY RESULT CAUSING
PROPERTY DAMAGE, PER-
SONAL INJURY OR LOSS OF
LIFE.
PLEASE READ THIS MANUAL
BEFORE INSTALLING AND
USING APPLIANCE
INSTALLER/CONSUMER
SAFETY INFORMATION
CERTIFIED
D
E
S
I
G
N
C
E
R
T
I
F
I
E
D
FOR YOUR SAFETY
Installation and service must
be performed by a qualified
installer, service agency or
the gas supplier.
10006740 1/05 Rev. 2
410 Admiral Blvd. • Mississauga, Ontario, Canada L5T 2N6 • 905-670-7777
www.majesticproducts.com • www.vermontcastings.com
CFM Specialty Home Products

2
DVRT41 Direct Vent Gas Fireplace
10006740
Installation & Operating Instructions ........................................................................................................... 3
Locating Your Fireplace .................................................................................................................... 3
Fireplace Dimensions........................................................................................................................ 4
Clearance to Combustibles ............................................................................................................... 6
Mantels ............................................................................................................................................ 6
Hearth ............................................................................................................................................ 6
Framing & Finishing .......................................................................................................................... 7
Final Finishing ................................................................................................................................... 7
Gas Specifications ............................................................................................................................ 7
Gas Inlet and Manifold Pressures ..................................................................................................... 7
High Elevations ................................................................................................................................. 7
Gas Line Installation.......................................................................................................................... 7
Remote ON/OFF Switch Installation ................................................................................................. 8
Alternate Switch Location.................................................................................................................. 8
EB-1 Electrical Box ........................................................................................................................... 8
Optional Top Vent Application........................................................................................................... 9
General Venting
General Venting .............................................................................................................................. 10
General Venting Information - Termination Location ...................................................................... 11
General Information Assembling Vent Pipes .................................................................................. 12
Flex Vent Pipes ............................................................................................................................... 12
Twist Lock Pipes ............................................................................................................................. 13
How to Use the Vent Graph ............................................................................................................ 13
Rear Wall Vent Application & Installation ........................................................................................ 13
Vertical Sidewall Application & Installation...................................................................................... 15
Below Grade Installation ................................................................................................................. 19
Vertical Through-the-Roof Application & Installation....................................................................... 19
Venting Components....................................................................................................................... 22
Operating Instructions
Glass Information ............................................................................................................................ 23
Louvre Removal .............................................................................................................................. 23
Window Frame Assembly Removal ................................................................................................ 23
Glass Cleaning ................................................................................................................................ 23
Replacement of Ceramic Hearth Panels ......................................................................................... 23
Installation of Logs .......................................................................................................................... 24
Burner Lava Rock Placement ......................................................................................................... 24
Large Lava Rock ............................................................................................................................. 24
Flame & Temperature Adjustment ..................................................................................................24
Flame Characteristics...................................................................................................................... 25
Inspecting the Venting System........................................................................................................ 25
Lighting and Operating Instructions (Honeywell Gas Valve) ........................................................... 26
Lighting and Operating Instructions (SIT Valve) ............................................................................. 27
Instructions for RF Comfort Valve ................................................................................................... 28
Troubleshooting Gas Control (Honeywell Gas Valve)..................................................................... 32
Troubleshooting Gas Control (SIT 820 Millivolt Gas Valve) ............................................................ 33
Troubleshooting Gas Control (SIT 822 Valve w/Honeywell Ignitor) ................................................ 34
Fuel Conversion Instructions........................................................................................................... 35
Maintenance
Cleaning the Standing Pilot Control System ................................................................................... 38
Replacement Parts ....................................................................................................................................... 39
Optional Accessories
Fan Kits ........................................................................................................................................... 43
Hard (Direct) Wire Hook Up ............................................................................................................ 43
Remote Controls ............................................................................................................................. 44
Ceramic Refractory Panels ............................................................................................................. 44
Decorative Bay Windows ................................................................................................................ 44
Decorative Frame Trim.................................................................................................................... 44
For Use in Mobile Homes: Model DVRT41RMH ......................................................................................... 45
Warranty ........................................................................................................................................................ 47
Energuide ...................................................................................................................................................... 48
PLEASE READ THE INSTALLATION & OPERATING INSTRUCTIONS BEFORE USING APPLIANCE.
Thank you and congratulations on your purchase of a CFM Specialty Home Products 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.
Table of Contents

3
DVRT41Direct Vent Gas Fireplace
10006740
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’ (610cm). 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“ (153mm)
clearance must be maintained from the perpendicular wall and
the front of the fireplace.
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. If the unit is being installed in a mobile home, the
installation should comply with the current CAN/CSA Z 240.4
code. For U.S.A Installations follow local codes and/or the
current National Fuel Gas Code. ANSI Z223.1/NFPA 54.
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 in the same
room as your 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
performed by a qualified installer, service agency or gas
supplier. A professional service person should be con-
tacted 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
clothing, nor should Christmas stocking 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 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, 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. 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.
Installation & Operating Instructions
Locating Your Fireplace
Proposition 65 Warning: Fuels used in gas,
woodburning 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
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 indi-
cated on the rating plate. This appliance is not
convertible for use with other gases, unless a certified
kit is used.
IMPORTANT:
PLEASE READ 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 CFM Specialty Home Products
company 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
-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.
Fig. 1 Locating Gas Fireplace
LU584-1
YEAB
C
D
F
YB
X

4
DVRT41 Direct Vent Gas Fireplace
10006740
Ref. DVRT41
A41” (1041mm)
B37” (940mm)
C36” (914mm)
D24¹⁄₂”(622mm)
E7”(178mm)
F6”(152mm)
G1¹⁄₄”(32mm)
H19¹⁄₂”(495mm)
I5¹⁄₂”(140mm)
J25” (635mm)
K5/8” (16mm)
L10³⁄₄”(273mm)
M2”(51mm)
N7⁵⁄₈”(194mm)
O1⁷⁄₈”(48mm)
P7”(178mm) Dia.
Q4”(102mm) Dia.
Framing Dimensions
R41¹⁄₂”(1054mm)
S41¹⁄₄”(1048mm)
T19¹⁄₂”(495mm)
U62¹⁄₄”(1581mm)
V44” (1118mm)
W31³⁄₄”(807mm)
Fireplace Dimensions (Installed as Top Vent)
Fig. 2 Fireplace specifications and framing dimensions.
S - Rough Opening Width
Rough
Opening
Height
Electrical
Access
Rough
Opening
Depth
Gas Line
Access
V
V
WK
U
T
H
I
JP
Q
K
O
N
F
D
E
G
G
A
R
M
L
B
Recessed
Nailing Flange

5
DVRT41Direct Vent Gas Fireplace
10006740
Fireplace Dimensions (Installed as Rear Vent)
H
R - Rough Opening Width
Gas Line
Access
Rough
Opening
Height
Electrical
Access
Rough
Opening
Depth
U
U
V
T
J
S
I
J
P
O
N
M
G
F
D
E
G
A
Q
L
K
B
Recessed
Nailing Flange
Ref. DVRT41
A41” (1041mm)
B37” (940mm)
C36” (914mm)
D24¹⁄₂”(622mm)
E7”(178mm)
F6”(152mm)
G1¹⁄₄”(32mm)
H19¹⁄₂”(495mm)
I25” (635mm)
J5/8” (16mm)
K10³⁄₄”(273mm)
L2”(51mm)
M7⁵⁄₈”(194mm)
N1⁷⁄₈”(48mm)
O31¹³⁄₁₆”(808mm)
P32⁹⁄₁₆”(827mm)
Framing Dimensions
Q41¹⁄₂”(1054mm)
R41¹⁄₄”(1048mm)
S19¹⁄₂”(495mm)
T62¹⁄₄”(1581mm)
U44” (1118mm)
V31³⁄₄”(807mm)
Fig. 3 Fireplace specifications and framing dimensions.

6
DVRT41 Direct Vent Gas Fireplace
10006740
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
Figures 4a, 4b and the Mantel Chart below.
The distances and reference points are not affected by
the fitting of a bay window front trim kit.
Noncombustible mantels and legs may be installed at
any height and width around the appliance. When
using paint or lacquer, it must be heat resistant to
prevent discoloration.
Clearance to Combustibles
Top of unit to ceiling.................................36” (914mm)
Front of unit to combustibles ...................36” (914mm)
Appliance
Top of standoff ........................................0” (0mm)
Bottom .....................................................0” (0mm)
Side .........................................................0” (0mm)
Back.........................................................0” (0mm)
Venting
Concentric sections of DV Vent...................1” (25mm)
Nonconcentric sections of DV Vent
Sides and bottom ..................................1” (25mm)
Top ........................................................2” (51mm)
J
F
G
H
I
Mantel
Leg
Black
Surround
Face
CFM164a
O
NM
L
K
Side of
Combustion Chamber
CFM170
Fig. 4b Combustible mantel leg minimum installation.
Mantel Mantel Leg from Side
Ref. Leg Depth Ref. of Comb. Opening
F10” (254mm) K 11¹⁄₂” (292mm)
G8” (203mm) L 9¹⁄₂” (241mm)
H6” (152mm) M 7¹⁄₂” (191mm)
I4” (101mm) N 5¹⁄₂” (140mm)
J2” (51mm) O 3¹⁄₂’” (89mm)
Hearth
A hearth is not mandatory, but is recommended for
aesthetic purposes. We recommend a noncombustible
hearth which projects out 12” (305mm) 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 insu-
lated to conform to applicable insulation
codes.
ABCDE
V
W
X
Y
Z
Fireplace
Louvre
Assembly Top
Top of Combustion
Chamber
Bottom of Door Trim
CFM146
Fig. 4a Combustible mantel minimum installation.
Mantel Chart
Mantel Shelf Mantel from Top
Ref. or Breast Plate Ref. of Comb. Chamber
Depth
V10” (254mm) A 19” (483mm)
W8” (203mm) B 17” (432mm)
X6” (152mm) C 15” (381mm)
Y4” (101mm) D 13” (330mm)
Z 2” (51mm) E 11” (279mm)
Maintain minimum 3/4”
(19mm) clearance to
combustible

7
DVRT41Direct Vent Gas Fireplace
10006740
Framing And Finishing
Check fireplace to make sure it is lev-
elled 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.
Final Finishing
Noncombustible materials such as brick or tile can be
extended over the edges of the face of the fireplace. Do
not cover the window frame assembly, any vent,
louvre assembly top or louvre assembly bottom. If a
Trim Kit is to be installed, brick and tile will have to be
installed flush with the side of this appliance.
DVRT41
Certified To
ANSI Z21.88-2002/CSA 2.33-2002
Vented Gas Fireplace Heater
Gas Inlet and Manifold Pressures
Natural LP (Propane)
Minimum Inlet Pressure 5.5” w.c. 11.0” w.c.
Maximum Inlet Pressure 14.0” w.c. 14.0” w.c.
Manifold Pressure 3.5” w.c. 10.0” w.c.
Gas Specifications
MAX. MIN.
GAS INPUT INPUT
MODEL FUEL CONTROL B.T.U.H B.T.U.H.
DVRT41RN Natural Gas Millivolt Hi/Lo 36,000 25,200
DVRT41RP Propane Millivolt Hi/Lo 36,000 27,000
DVRT41RFN Natural Gas Comfort Control 36,000 25,200
DVRT41RFP Propane Comfort Control 36,000 27,000
DVRT41EN Natural Gas 24 Volt Hi/Lo 36,000 25,200
DVRT41EP Propane 24 Volt Hi/Lo 36,000 27,000
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
When purging gas line the front glass
must be removed.
The gas pipeline can be brought in through the right
side of the appliance. Knockouts are provided at
convenient locations to allow for the gas pipe installa-
tion and testing of any gas connection.
The gas line connection can be made with properly
tinned 3/8" copper tubing, 1/2" rigid pipe or an approved
flex connector. Since some municipalities have
additional local codes, it is always best to consult your
local authority and the CSA-B149.1 installation codes.
For USA installations consult the current National Fuel
Gas Code, ANSI Z223.1/NFPA 54.
AB
Fig. 5 Drywall flange location.
Flange Location for
Desired Drywall Depth
Flange Drywall
Position Depth
A1/2” / 13mm
B5/8” / 16mm
FP1539

8
DVRT41 Direct Vent Gas Fireplace
10006740
Remote ON/OFF Switch Installation
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 from 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. 7)
FP1024
Fig. 8 Alternate switch location.
Always check for gas leaks with a mild
soap and water solution applied with a
brush no larger than 1” (25mm). Never
apply soap and water solution with a
spray bottle. Do not use an open flame
for leak testing.
The fireplace valve must not be sub-
jected 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.
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 ap-
proved fittings. Always provide a union when using
black iron pipe so that the gas line can be easily
disconnected for burner or fan servicing. (Fig. 6) See
the gas specifications for pressure details and ratings.
Alternate Switch Location
The remote switch can be installed on either side of the
access door. Mount the switch to the switch bracket
provided. Screw the bracket on either side of the
frame, line up the screws with the prepunched holes.
(Fig. 8)
EB-1 Electrical Box
The fireplace, when installed, must be
electrically connected and grounded in
accordance with local codes or, in the
absence of local codes, with the current
CSA C22.1 Canadian Electrical Code.
For USA installations, follow the local
codes and the national Electrical Code
ANSI/NFPA No. 70.
It is strongly suggested that the wiring of
the EB-1 Electrical Junction Box be
carried out by a licensed electrician.
Ensure that the power to the supply line
has been disconnected before commenc-
ing this procedure.
1/2” Gas Supply
1/2” NPT x 3/8” Flare Shut-off
Valve 3/8” Flex Line
(from valve)
FP297a
Fig. 6 Typical gas supply installation.
TPTH TH
TP
FP1218
Remote
ON/OFF
Switch
Fig. 7 Remote switch wiring diagram for R models.

9
DVRT41Direct Vent Gas Fireplace
10006740
The EB-1 electrical junction box has been supplied
standard on the DV360/580 models to allow for the
easy installation of an optional fan kit.
To connect the EB-1 box to the house electrical supply,
follow the steps below.
1. Unscrew the retaining screw from the EB-1 base
plate (Fig. 9) and remove the EB-1 assembly from
the fireplace.
2. Remove the front cover of the EB-1 box.
3. Remove the plug socket assembly from the EB-1
box.
4. Feed the supply line in from the outside through the
cable clamp. (Fig. 9)
5. Connect black wire of the power supply line to the
brass screw (polarized) of the socket assembly.
6. Connect the white wire of the power line to the
chrome screw of the socket assembly.
7. Connect the ground wire of the supply line to the
green screw of the socket assembly.
8. Refit the socket assembly back into the electrical
box and replace the cover plate. Secure the cable
with the clamp on the outside of the unit to prevent
strain on the connections.
9. The EB-1 electrical junction box is now ready to
supply power to the FK12 or FK24 fan kits if fitted.
Optional Top Vent Application
The DVRT41 fireplace is shipped as a rear vent unit. If
the layout requires a top vent, convert the unit following
the steps below.
1. Remove the 10 screws securing outer collar adapter
to fireplace. (Fig. 10)
2. Set outer collar adapter aside.
3. Remove insulation from top of unit and discard.
Remove the four (4) screws securing flue cover to
top of unit and remove flue cover. (Fig. 11)
Flue
Pipe
Remove
Screws
(5)
Outer Collar
Adapter
Remove
Screws (5) FP1030
Rear View
Fig. 10 Remove screws from outer collar adapter.
FP580
Fig. 9 EB-1 receptacle.
OUTSIDE
ELECTRICAL BOX
FRONTOFUNIT
INSIDE
FRONT OF UNIT
4. Remove the four (4) screws securing flue pipe to
back of unit. Remove flue pipe. (Fig. 11)
5. Secure flue cover to back of flue outlet. Be sure to
replace gasket. (Fig. 12)
6. Install flue pipe and gasket removed in step 4 to top
of unit with four (4) screws. Be sure to replace
gasket. (Fig. 12)
7. Secure outer collar adapter to unit with the round
collar on top, secure with 10 screws.
NOTE: Be sure not to damage any gasket material.
CAUTION: Remove insulation. Insulation extends
beyond opening in top of unit. Be sure
to remove all insulation before complet-
ing conversion. Insulation measures
9¹⁄₄” x 22³⁄₄” (235mm x 578mm). If the
unit is converted back to a rear vent, the
insulation (Part #20003129) must be
replaced.
Fig. 11 Remove flue cover and flue pipe.
Remove
Screws (4)
Remove Screws (4)
Flue
Cover
Flue
Pipe
FP1027
Insulation

10
DVRT41 Direct Vent Gas Fireplace
10006740
FP1031
Fig. 13 Completed conversion.
After conversion to top vent configura-
tion, the 4” (102mm) flue pipe should be
concentric within the 7” (175mm) outer
collar.
Your fireplace is approved to be vented either through
the side wall, or vertical through the roof.
•Only CFM Corporation venting components
specifically approved and labelled for this fire-
place may be used.
•If vent terminal is installed in an accessible location,
Vent Termination Guard #53525 shall be installed.
•Venting terminals 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” (13mm) per 12” (305mm).
There must not be any obstruction such as bushes,
garden sheds, fences, decks or utility buildings within
24" (610mm) 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 termi-
nation area after snow falls, and clear to prevent acci-
dental 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 observ-
ing the minimum clearances as shown on following
page.
General Venting
Flue Cover
Replace
Screws (4)
Flue Pipe
FP1028
Fig. 12 Replacing flue cover and flue pipe.
Replace
Screws (4)

11
DVRT41Direct Vent Gas Fireplace
10006740
V
V
V
V
V
V
V
X
X
X
D
E
B
B
B
C
B
M
B
AJK
F
L
VENT TERMINATION AIR SUPPLY INLET AREA WHERE TERMINAL IS NOT PERMITTED
H
I
Fixed
Closed
Fixed
Closed
Operable
Operable Fixed
Closed
V
B
INSIDE
CORNER DETAIL
V
A
G
V
NN
V
V
G
G
A
CFM145a
Fig. 14 Vent termination clearances.
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’
(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 CFM Specialty Home Products Direct Vent fireplaces are certified as part of the
appliance, with clearances tested and approved by the listing agency.
Canadian Installations1US Installations2
General Venting Information - Termination Location

12
DVRT41 Direct Vent Gas Fireplace
10006740
Outside Corner
Inside Corner
Termination Clearances
Termination clearances for buildings with combustible and noncombustible exteriors.
A =
Combustible
6"(152mm)
Noncombustible
2"(50mm)
B =
Combustible
6"(152mm)
Noncombustible
2"(50mm)
A
Balcony -
with no side wall
G =
Combustible &
Noncombustible
12"(305mm)
G
Balcony -
with perpendicular side wall
H = 24"(610mm)
J = 20"(508mm)
H
J
B
Recessed Location
C = Maximum depth of 48"
(1219mm) for recessed
location.
D = Minimum width for back wall
of a recessed location.
Combustible 38"(965mm)
Noncombustible 24"(610mm)
E = Clearance from corner in
recessed location.
Combustible 6"(152mm)
Noncombustible 2"(50mm)
CDC
E
V
V
Combustible &
Noncombustible
VV
V
584-15
Fig. 15 Termination clearances.
General Information Assembling Vent Pipes
Canadian Installations
The venting system must be installed in accordance
with the current CSA-B149.1 installation code.
USA Installations
The venting system must conform to local codes and/or
the current National Fuel Code ANSI Z223.1/NFPA 54.
Only venting components manufactured by CFM
Corporation may be used in Direct Vent systems.
Flex Vent Pipes
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” (25mm) onto
the collars of the fireplace and termination. If the
termination has an internal bead, be sure to overlap
and secure 1” (25mm) past the bead.
* Be sure the venint is actually crushed before pro-
ceeding. Apply a tug to be sure the vent will not slip off
the collars.
Repeat process with 7” flex vent pipe. The same
procedure must be performed on the vent side.
Apply High Tempera-
ture Sealant
Hose Clamp
FP1471
Fig. 16 Apply high temperature sealant to 4” and 7” pipes.

13
DVRT41Direct Vent Gas Fireplace
10006740
Male End Female
End
Screw Holes TWL100
Fig. 17 Twist-Lock pipe joints.
Twist Lock Pipes
When using 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 collars on the fireplace and
termination, and the sliding joint of any telescopic vent
section used in the system.
To join twist lock pipes together, simply align the beads
of the male end with the grooves of the female end,
twisting the pipe until the flange on the female end
contacts external flange on the male end. It is recom-
mended that you secure the joints with three (3) sheet
metal screws, however, this is not mandatory with twist
lock pipe. (Fig. 17)
To make it easier to assembly the joints, we suggest
putting a lubricant (Vaseline or similar) on the male end
of the twist lock pipe prior to assembly.
How to Use theVent Graph
The Vent Graph should be read in conjunction with the
following vent installation instructions to determine the
relationship between the vertical and horizontal dimen-
sions fo 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. 17),
locate the point intersecting with the 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 unit is 11’
(3.4m) the horizontal run to the face of the outer wall
must not exceed 14’ (4.3m).
EXAMPLE B:
If the vertical dimension from the floor of the unit is 7’
(2.1m), the horizontal run to the face of the outer wall
must not exceed 8¹⁄₂’ (2.6m).
Refer to Page 19 for venting
requirements for snorkels.
Vertical dimension from the floor of the unit
to the center of the horizontal vent pipe
Fig. 18 Sidewall venting graph. (Dimensions in feet.)
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
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
eg: A
eg: B
Horizontal dimension from the outside face of the wall to the
center of the fireplace vent flange
When installed as a rear vent unit this appliance may be
vented directly to a termination located on the rear wall
behind the appliance.
•Only CFM Corporation venting components are
approved to be used in these applications (See
‘Venting Components’ listed for different installation
requirements).
•The maximum horizontal distance between the rear
of the appliance (or end of the transition elbow in a
corner application) and the outside face of the rear
wall is 20” (508mm). (Fig. 19, 20)
•Only one 45°elbow is allowed in these installations.
•Minimum clearances between vent pipe and com-
bustible materials are as follows:
Top - 2" (51 mm)
Sides - 1" (25 mm)
Bottom - 1" (25 mm)
Rear Wall Vent Application

14
DVRT41 Direct Vent Gas Fireplace
10006740
Rear Wall Vent Installation
Step 1
Locate and cut the vent opening in the wall. For com-
bustible walls first frame in opening. (Fig. 21)
NOTE: When using flex vent, the opening will have to
be measured according to the 1/2” (13mm) rise in 12”
(305mm) vertical run.
Combustible Walls: Cut a 10³⁄₈”H x 9³⁄₈” W (265mm x
240mm) hole through the exterior wall and frame as
shown. (Fig. 21)
Noncombustible Walls: Hole opening should be 7¹⁄₂”
(191mm) diameter.
Zero clearance sleeve is only required for
combustible walls.
Step 2
Measure wall thickness and cut zero clearance sleeve
parts to proper length (Maximum 12” / 305mm). As-
semble sleeve to its maximum opening (10³⁄₈” x 9³₈”)
and attach to firestop assembly. (Fig. 22)
Step 3
Measure the horizontal length requirement for the
venting including a 2” (51mm) overlap, i.e. from the
elbow to the outside wall face plus 2” (51mm). (Fig. 20)
Step 4
Install the 4” (102mm) vent to the appliance collar and
secure with 3 sheet metal screws. Install the 7”
(178mm) vent pipe to the appliance collar and secure
with 3 sheet metal screws. It is not necessary to seal
this connection. If a 45°elbow is being used attach the
elbow to the appliance in the same manner then attach
the venting to the elbow.
It is critical that there is no downward
slope away from the appliance when
connecting the vent or elbow.
Step 5
Guide the venting through the vent hole as you place
the appliance in its installed position. Guide the 4”
(102mm) and 7” (178mm) collar of the vent termination
into the outer ends of the venting. Do not force the
termination. If the vent pipes do not align with the
termination, remove and realign the venting at the
appliance flue collars. (Fig. 23) Attach the termination
to the wall as outlined in the instruction sheet supplied
with the termination.
Fig. 21 Locate vent opening on wall.
Framing
Detail
9³⁄₈"
(240 mm)
10³⁄₈"
(265 mm)
Fireplace Hearth
Rnd.
7¹⁄₂" Dia.
(190 mm)
Opening for Noncombustible Wall
Fireplace Hearth VO584-100
Vent Opening for Combustible Wall
#8 Screws
(2)
Adjustable Zero Clearance Sleeve
Firestop
#8 Screws (2)
#8 Screws (2)
Adjustable Zero
Clearance Sleeve
Max. Length 12"
(305mm)
Fig. 22 Adjustable zero clearance sleeve. ZCS101
DVR584-600
Fig. 19 Rear vent application, no elbows.
20" (508 mm)
Max. Rear Vent Top View
20"
(508mm)
Max.
20"
(508mm)
Max.
Fig. 20 Rear vent application, one 45°elbow.
Rear Vent Top View, Corner Installation FP836

15
DVRT41Direct Vent Gas Fireplace
10006740
Finished
Wall
Vent
Termination
Fig. 23 Side view of final unit location. FP1005
Vertical Sidewall Application
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, showing the relationship between
vertical and horizontal side wall venting, will help to
determine the various dimensions allowable.
Minimum clearance between vent pipes and com-
bustible materials is 1” (25mm) on top, bottom and
sides unless otherwise noted.
When vent termination exits through foundations less
than 20” (508mm) below siding outcrop, the vent pipe
must flush up with the siding.
It is 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 (or the top of
the Transition Elbow) to the face of the outer wall.
Horizontal plane means no vertical rise exists on this
portion of the vent assembly.
When installing the appliance as a rear
vent unit, the 90°or 45°Transition Elbow
attached directly to the rear of the unit is
NOT INCLUDED in the following criteria
and calculations, and unless specifically
mentioned should be ignored when
calculating venting layouts.
Rear Wall Vent Installations -
Flex Vent Pipe
Follow Steps 1 and 2 on Page 14.
Step 3
Install the 4” (102mm) flex vent pipe to the appliance
collars described in “General Information Assembling
Vent Pipes”, Page 12. If the installation requires a 45°
angle, grasp the vent pipe close to the appliance collar
and bend to 45°. DO NOT exceed 45°. (Fig. 24)
Install the 7” vent pipe in the same manner as Step 2.
Termination
Flex Section
Appliance Collars
FP1473
Fig. 24 Grasp the vent pipe close to the collar and bend to
45°angle. Do not exceed 45°.
NOTE: There must be a 1/2” (13mm) rise in a 12”
(305mm) length of flex vent.
Step 4
Assemble the flex vent to the collars on the termination
as you did on the appliance.
1/2" (13mm)
12" (305mm)
FP1472
Fig. 25 There must be a 1/2” rise in 12s” length.

16
DVRT41 Direct Vent Gas Fireplace
10006740
In Figure 28 & 29, dimension A plus B must not be
greater than 17’ (5.2m)
•The maximum number of 45°elbows permitted per
side wall installation is two (2). These elbows can
be installed in either the vertical or horizontal run.
•For each 45°elbow installed in the horizontal run,
the length of the horizontal run MUST be reduced
by 18” (457mm). This does not apply if the 45°
elbows are installed on the vertical part of the vent
system.
•The maximum number of elbow degrees in a sys-
tem is 270°. (Fig. 30)
Example: Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total angular variation = 270°
1
2
3
4
1
2
3
4
1 + 2 + 3 + 4 = 270°
FP1180
Fig. 30 Maximum elbow usage.
•The maximum number of 90°elbows per side wall
installation is three (3). (Fig. 2)
•If a 90°elbow is fitted directly on top of the fireplace
flange the maximum horizontal vent run before the
termination or a vertical rise is 36” (914mm). (Fig.
27)
3 x 90°
Elbows 3 x 90°
Elbows
FP1176
Fig. 26 Maximum three (3) 90°elbows per installation.
7’6"
(2.3m)
AB
A + B = 17’ (Max.)
(5.2m)
FP1178
Fig. 28 Horizontal run reduction.
36"
(914mm)
Max.
36"
(914mm)
Max.
FP1177
Fig. 27 Maximum horizontal run with no rise.
A + B = 17’
(518cm) Max.
10'
(254 cm)
7'
(178 cm)
Fig. 29 Maximum vent run with elbows.
V584-201
8'
(244 cm)
AB
•If a 90°elbow is used in the horizontal vent run
(level height maintained) the horizontal vent length
is reduced by 36” (914mm). (Fig. 28 & 29) This does
not apply if the 90°elbows are used to increase or
redirect a vertical rise. (Fig. 26)
Example: According to the vent graph (Page 13) the
maximum horizontal vent length in a system with a 7¹⁄₂’
(2.3m) rise is 20’ (6m) and if a 90°elbow is required in
the horizontal vent it must be reduced to 17’ (5.2m).

17
DVRT41Direct Vent Gas Fireplace
10006740
XX
FP1181
Fig. 33 Vertical height requirements.
Vertical Sidewall Installation
Twist Lock Pipe
Step 1
Locate vent opening on the wall. It may be necessary
to first position the fireplace and measure to obtain
hole location. Depending on whether the wall is com-
bustible or noncombustible, cut opening to size. (Fig.
31) (For combustible walls first frame in opening.)
NOTE: When using flex vent, the opening will have to
be measured according to the 1/2” (13mm) rise in 12”
(305mm) vent run.
Combustible Walls: Cut a 9³⁄₈”H x 9³⁄₈”W (240mm x
240mm) hole through the exterior wall and frame as
shown. (Fig. 31)
Noncombustible Walls: Hole opening must be 7¹⁄₂”
(191mm) in diameter.
#8 Screws
(2)
Adjustable Zero Clearance Sleeve
Firestop
#8 Screws (2)
#8 Screws (2)
Adjustable Zero
Clearance Sleeve
Max. Length 12"
(305mm)
Fig. 32 Adjustable zero clearance sleeve.
ZCS101
Zero clearance sleeve is only required
for combustible walls.
Fig. 31 Locate vent opening on wall.
9³⁄₈"
(240mm)
Vent Opening for Combustible Wall
Fireplace Hearth
Framing Detail
7¹⁄₂" Dia.
(190mm)
Vent Opening Noncombustible Wall
9³⁄₈"
(240mm)
Fireplace Hearth VO584-100
Step 4
Apply a band of silicone to the inner and outer flue
collars of the fireplace and using appropriate length of
pipe section(s) attach to fireplace with three (3) screws.
Follow with the installation of the inner and outer
elbow, again secure joints with three (3) sheet metal
screws. Wipe off any excess high temperature sealant.
Step 2
Measure wall thickness and cut zero clearance sleeve
parts to proper length (MAXIMUM 12” / 305mm).
Assemble sleeve and attach to firestop with #8 sheet
metal screws (supplied). Install firestop assembly. (Fig.
32)
Step 3
Place fireplace into position. Measure the vertical
height (X) required from the base of the flue collars to
the center of the wall opening. (Fig. 33)
Step 5
Measure the horizontal length requirement including a
2” (51mm) overlap, i.e. from the elbow to the outside
wall face plus 2” (51mm) (or the distance required if
installing a second 90°elbow). (Fig. 34)
Always install horizontal venting on a
level plane.
Step 6
Use appropriate length of pipe sections - telescopic or
fixed - and install. The sections which go through the
wall are packaged with the starter kit, and can be cut to
suit if necessary.

18
DVRT41 Direct Vent Gas Fireplace
10006740
Sealing vent pipe and firestop gaps with high
temperature sealant will restrict cold air being
drawn in around fireplace.
Step 7
Apply high temperature sealant to 4” (102mm) and 7”
(178mm) collars or the termination one inch away from
crimped end. Guide the vent terminations 4” and 7”
collard into their respective vent pipes. Double check
that the vent pipes overlap the collars by 2” (51mm).
Secure the termination to the wall with screws provided
and caulk around the wall plate to weatherproof. As an
alternative to screwing the termination directly to the
wall, you may also use expanding plugs or an ap-
proved exterior construction adhesive. You may also
attach the termination with screws through the inner
body into the 4” vent pipe, however for this method,
you must extend the 4” pipe approximately 6” (152mm)
beyond the outer face of the wall.
Support horizontal pipes every 36”
(914mm) with metal pipe straps.
X
X
FP1182
Fig. 34 Horizontal length requirement.
Vertical Sidewall Installation
Flex Vent Pipe
NOTE: The 40” (1016mm) flex vent is used for 90°off
the top of the unit then out the back wall.
Follow Step 1 and 2 on Page 17.
Step 3
Install the four (4) spacer springs on the 4” flex vent
pipe. When installing the spacer springs around the 4”
pipe, stretch the spring to approximately 15” (381mm),
wrap the spring around the pipe and interlock the ends
of the spacer spring approximately 2” (51mm). Meas-
ure 6³⁄₄” (172mm) from the end of the pipe. Place the
next spring 5” (127mm) from the previously installed
spring. Place the next spring 6” (152mm) from the last
spring. Finally place the last spring 12” (305mm) from
the last spring installed. (Fig. 35)
12"
(305mm)
6"
(152mm)
5"
(127mm)
6³⁄₄"
(172mm)
4” Flex
Vent Pipe
Spacer
Spring
FP1474
Fig. 35 Install spacer springs.
Step 4
Install the 4” (102mm) flex vent pipe to the appliance
collar as described on Page 12. Secure the end with
the first spring 6³⁄₄” (172mm) from the flex pipe end to
the unit.
Step 5
Slide the 7” (178mm) flex vent pipe over the 4” flex
vent pipe and secure the 7” collar as described on
Page 12.
Step 6
Bend the flex pipe horizontal so the bottom of the
horizontal pipe measure 6¹⁄₂” (165mm) from the top of
the unit immediately after the 90°formation. (Fig. 36)
Be sure to follow the 1/2” (13mm) rise in a 12”
(305mm) horizontal run rule.
Step 7
Install the 4” flex then 7” flex to the termination.
6¹⁄₂" (165mm)
FP1475
Fig. 36 Bend flex vent at 90°so horizontal portion is 6¹⁄₂”
(165mm) off top of unit.

19
DVRT41Direct Vent Gas Fireplace
10006740
Below Grade Installation
When it is not possible to meet the required vent
terminal clearances of 12” (305mm) above grade level,
a snorkel kit is recommended. It allows installation
depth down to 7” (178mm) below grade level. The 7”
(178mm) is measured from the center of the horizontal
vent pipe as it penetrates through the wall.
Ensure the sidewall venting clearances are ob-
served. If venting system is installed below ground,
we recommend a window well with adequate and
proper drainage to be installed around the termina-
tion area.
If installing a snorkel, a minimum 24” (610mm) vertical
rise is necessary. The maximum horizontal run with the
24” vertical pipe is 36” (914mm). This measurement is
taken from the collar of the fireplace (or transition
elbow) to the face of the exterior wall. See the Sidewall
Venting Graph for extended horizontal run if the verti-
cal exceeds 24” (610mm).
1. Establish vent hole through the wall (Fig. 31)
2. Remove soil to a depth of approximately 16”
(406mm) below base of snorkel. Install drain pipe.
Install window well (not supplied). Refill hole with
12” (305mm) of coarse gravel leaving a clearance of
approximately 4” (102mm) below snorkel. (Fig. 37)
3. Install vent system.
4. Ensure a watertight seal is made around the vent
pipe coming through the wall.
5. Apply high temperature sealant caulking (supplied)
around the 4” and 7” snorkel collars.
6. Slide the snorkel into the vent pipes and secure to
the wall.
7. Level the soil so as to maintain a 4” (102mm)
clearance below snorkel. (Fig. 37)
Zero Clearance Sleeve
(if required)
Firestop
7" Pipe
7TDVSNORK
(Snorkel)
4" Clearance Min.
Window Well
Gravel
Drain
Foundation Wall
*A minimum of 24"
(608mm) vertical pipe
must be installed when
using the 7TDVSNORK.
BG402a
24" (608mm)
Minimum*
Screws
Fig. 37 Below grade installation.
Do not back fill around snorkel.
A clearance of at least 4” must be main-
tained between the snorkel and the soil.
If the foundation is recessed, use recess brackets (not
supplied) for securing lower portion of the snorkel.
Fasten brackets to wall first, then secure to snorkel
with self drilling #8 x 1/2 sheet metal screws. It will be
necessary to extend vent pipes out as far as the
protruding wall face. (Fig. 38)
Snorkel
Wall
Screws
Sheet Metal
Screws
Watertight
Seal Around
Pipe
Foundation
Recess
BG401
Fig. 38 Snorkel installation, recessed foundation.
Vertical Through-the-Roof Application
This gas fireplace has been approved for:
•Vertical installations up to 40’ (12m) in height. Up to
a 10’ (3m) horizontal vent run can be installed within
the vent system using a maximum of two 90°
elbows. (Fig. 39)
•Up to two 45°elbows may be used within the
horizontal run. For each 45°elbow used on the
horizontal plane, the maximum horizontal length
must be reduced by 18” (450mm).
Example: Maximum horizontal length:
No elbows = 10’ (3m)
1 x 45°elbow = 8.5’ (2.6m)
2 x 45°elbows = 7’ (2.1m)
•A minimum of an 8’ (2.5m) vertical rise is required.
•Two sets of 45°elbow offsets may be used within
the vertical sections. From 0 to a maximum of 8’
(2.5m) of vent pipe can be used between elbows.
(Fig. 40)
•7DVCS supports offsets. (Fig. 42) This application
will require that you first determine the roof pitch
and use the appropriate starter kit. (Refer to Venting
Components List)
•The maximum angular variation allowed in the
system is 270°. (Fig. 40)
•The minimum height of the vent above the highest
point of penetration through the roof is 2’ (610mm).
(Fig. 43) Refer to note 2, Page 13.

20
DVRT41 Direct Vent Gas Fireplace
10006740
Vertical Through-the-Roof Installation
1. Locate your fireplace.
2. Plumb to center of the (4”) flue collar from ceiling
above and mark position.
3. Cut opening equal to 9³⁄₈” x 9³⁄₈” (240mm x 240mm).
4. Proceed to plumb for additional openings through
the roof. In all cases, the opening must provide a
minimum of 1 inch clearance to the vent pipe, i.e.,
the hole must be at least 9³⁄₈” x 9³⁄₈” (240mm x
240mm).
5. Place fireplace into position.
6. Place firestop(s) #7DVFS or Attic Insulation Shield
#7DVAIS into position and secure. (Fig. 41)
7. Install roof support (Fig. 42) and roof flashing
making sure upper flange is below the shingles.
(Fig. 44)
8. Install appropriate pipe sections until the venting is
above the flashing. (Fig. 44)
9. Install storm collar and seal around the pipe.
10. Add additional vent lengths for proper height. (Fig.
43)
11. Apply high temperature sealant to 4” and 7” collars
of vertical vent termination and install.
If there is a room above ceiling level, fire stop spacer
must be installed on both the bottom ad the top side of
the ceiling joists. If an attic is above ceiling level a
7DVAIS (Attic Insulation Shield) must be installed.
The enlarged ends of the vent section always face
downward.
Joist
Attic Insulation Shield
Ceiling Installation
Upper Floor
11"
(279mm)
Firestop
Spacer
Nails (4)
Fig. 41 Place firestop spacer(s) and secure.
FP1029
11"
(279mm)
1
2
3
4
1
2
3
4
1 + 2 + 3 + 4 = 270°
FP1179
Fig. 40 Maximum elbow usage.
Max. Height 40’ (12.2m)
Min. Height 8’ (2.4m)
Max. 10’ (3m)
Support Straps
Every 3’ (.9m)
Max.
Height 40’ (12.2m)
Min.
Height 8’ (2.4m)
Max. 10’ (3m)
FP1183
Fig. 39 Support straps for horizontal runs.