Rear Wall Vent Installation - Vermont Castings DVRT36 Homeowner's Installation & Operating Manual

Max. 20"
(508 mm)
Top view flat installation
Top view corner installation
Fig. 19 Rear vent application, maximum horizontal distance.

Rear Wall Vent Installation

Step 1
Locate and cut the vent opening in the wall.
For combustible walls, first frame in opening. (Fig. 20)
Combustible Walls: Cut a 10 " H x 9 " W
(265 x 240mm) hole through the exterior wall and
frame as shown.
Noncombustible Walls: Hole opening should be
7 " (190mm) in diameter.
Zero clearance sleeve is required only
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 (10 " x
9 ")(265 x 240mm), and attach to firestop with #8
sheet metal screws (supplied). Install firestop assem-
bly. (Fig. 21)
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. 19)
Step 4
Install the 4" (102mm) vent to the appliance collar and
secure with 3 sheet metal screws. Install the 7"
(175mm) vent pipe to the appliance collar and secure
with 3 sheet metal screws. If a 45° elbow is being
10002428
Vermont Castings, Majestic Products DVRT36/ 39/ 43
Max. 20"
(508 mm)
FP1188
Vent Opening — Combustible Wall
(240mm)
9 "
10 "
(254mm)
Vent Opening — Noncombustible Wall
7 "
(190mm)
Fig. 20 Vent opening, side wall.
#8 Screws (2)
Fig. 21 Adjustable zero clearance sleeve
used, attach the elbow to the appliance with sealant in
the same manner then attach the venting to the elbow.
It is not necessary to seal the 45° elbow to the starter
pipe or termination in the straight out and 45° installa-
tion in Figure 19.
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" (175mm) collars 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. 22) Attach the termination
to the wall as outlined in the instruction sheet supplied
with the termination.
(framing detail)
CFM116
Maximum Length
12" (305mm)
#8 Screws (2)
Side View
Firestop
CFM135a
15