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STEP 3. To install the Round Support Box/Wall
Thimble in a at ceiling, cut a 10” square
hole in the ceiling, centered in the hole
drilled in Step 2. Frame the hole as shown
in Figure 23.
STEP 4. Assemble the desired lengths of black pipe
and elbows necessary to reach from the
appliance adapter up through the Round
Support Box. Insure that all pipe and
elbow connections are in their fully twist-
locked position.
STEP 5. Cut hole in the roof centered on the small
hole placed in the roof from Step 2. The
hole should be of sufcient size to meet
minimum requirements for Clearance
to Combustibles, as specied. Continue
to assemble lengths of pipe and elbows
1
1
/
2
” (4cm) long
wood screw (x4)
10” (25.4cm) x 10” (25.4cm)
inside framing
Ceiling Joist
Framing
Figure 23: Wall Framing for Hole for Vertical
Installation.
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 roof line.
The galvanized nish is
desirable above the roof
line, due to the higher
corrosion resistance.
STEP 6. Once the pipe sections
have been joined, and
run up through the hole
in the roof, slip an elbow
strap over the exposed
sections, bend the
support straps outwards,
and push the elbow strap
Initial Installation
QUALIFIED INSTALLERS ONLY
VERTICAL INSTALLATION:
STEP 1. Check the instructions for required clearances (air spaces) to combustibles when passing
through ceilings, walls, roofs, enclosures, attic rafters, or other nearby combustible surfaces.
Do not pack air spaces with insulation.
STEP 2. Set the gas appliance in the desired location. Drop a plumb bob down from the ceiling to
the position of the appliance ue 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, 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, to avoid cutting load bearing members.
Vertical
Termination
Storm Collar
Flashing
Roofing nails
Elbow Strap
Figure 24: Vertical Vent Termination Installation.
19