13
250-3692 (11/2000) DVi32 Gas Insert
FIG. 2
Plumber’s Tape
Connected to Wall
Strap
Wall Strap
(2) 45 Degree
Elbows
VERTICAL TERMINATIONS, CONT.
USING GS SERIES PIPE (cont.)
Step 2
.
Set the gas appliance in its desired location. Drop
a plum bob down from the ceiling to the position of
the appliance flue exit, and mark the location where
the vent will penetrate the ceiling. Drill a small hole
at this point. Next, drop a plumb bob from the roof
to the hole previously drilled in the ceiling, and mark
the spot where the vent will penetrate the roof.
Determine if ceiling joists, roof rafters, or other
framing will obstruct the venting system. You may
wish to relocate the appliance, or to offset, as
shown in Figure 2, to avoid cutting loadbearing
members.
Step 3.
To install the round support box in a flat ceiling, cut
a 10” x 10” (254mm x 254mm) square hole in the
ceiling, centered on the hole drilled in step 2. Frame
the hole as shown in Figure 3.
Step 4.
Assemble the desired lengths of black pipe and
elbows necessary to reach from the appliance up
through the round support box. Insure that all pipe
and elbow connections are in their fully twist-locked
position.
Step 5.
Cut a hole in the roof centered on the small drill hole
placed in the roof in step 2. The hole should be of
sufficient size to meet the minimum requirements
for clearance to combustibles, as specified. Continue
to assemble lengths of pipe and elbows necessary
to reach from the ceiling support box up through the
roof line. Galvanized pipe and elbows may be utilized
in the attic, as well as above the roofline. The
galvanized finish is desirable above the roofline, due
to its higher corrosion resistance
NOTE:
(1)
If an offset is necessary in the attic to avoid
obstructions, it is important to support the vent pipe
every 3’ (914mm), to avoid excessive stress on the
elbows, and possible separation. Wall straps are
available for this purpose (Figure 3).
(2)
Always use 45° elbows. The 45° elbow offers less
restriction to the flow of flue gases and intake air.
FIG. 3
Framing
1 - 1/2"
Long
Wood
Screws
Ceiling Joists
f i r e - p a r t s . c o m
