CFDV Series Gas Fireplace
18
20306739
REAR WALL VENT APPLICATIONS
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 Vermont Castings Group approved venting com-
ponents are approved to be used in these applications
(Refer to ‘Venting Components’ listed for different in-
stallation requirements).
•
The maximum horizontal distance between the rear of
the appliance (or end of the transition elbow in a cor-
ner application) and the outside face of the rear wall is
20" (508 mm).
Figure 23
•
Only one 45° elbow is allowed in these installations.
•
Minimum clearances between vent pipe and combus-
tible materials are as follows:
Top – 3" (76 mm), except at outside wall 1" (25 mm)
Sides – 1" (25 mm)
Bottom – 1" (25 mm)
20”
(508 mm)
Max.
20”
(508 mm)
Max.
Rear Vent Top View
Figure 23 –
Rear Vent Application, No Elbows
REAR WALL VENT INSTALLATION – TWIST
LOCK PIPE
Step 1
Locate and cut the vent opening in the wall.
For combustible walls fi rst frame in opening.
Figure 24
NOTE:
When using fl ex vent, the opening will have to be
measured according to the 1" (25 mm) rise in 24" (610
mm) vertical run.
Combustible Walls:
Cut a 9
5
⁄
8
" H x 9
5
⁄
8
" W (244 x 244
mm) hole through the exterior wall and frame as shown.
Figure 24
Noncombustible Walls:
Hole opening should be 7
1
⁄
2
"
(191 mm) diameter.
Step 2
Secure fi restop to the inside frame, center in the 9
5
⁄
8
" x
9
5
⁄
8
" vent opening.
Step 3
Measure the horizontal length requirement for the venting
including a 2" (51 mm) overlap, i.e. from the elbow to the
outside wall face plus 2" (51 mm).
Figure 25
Step 4
Install the 4" (102 mm) vent to the appliance collar and
secure with 3 sheet metal screws. Install the 7" (178 mm)
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 appli-
ance 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" (102 mm)
and 7" (178 mm) 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 fl ue collars.
Fig-
ure 25
. Attach the termination to the wall as outlined in the
instruction sheet supplied with the termination.
VENTING INSTALLATION
Vent Opening for Combustible Walls
9
5
⁄
8
"
(244 mm)
Min.
Fireplace Hearth
Framing Detail
Opening for Noncombustible Wall
7
1
⁄
2
"
(190 mm)
Fireplace Hearth
FP2293
Figure 24 –
Locate vent opening on wall
9
5
⁄
8
"
(244 mm) Min.
FP3002
