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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 30.
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.
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 necessary to reach from the ceiling
support box up through the roof line. Galvanized
pipe and elbows may be utilized in the attic, as
1
1
/
2
” (4cm) long
wood screw (x4)
10” (25.4cm) x 10” (25.4cm)
inside framing
Ceiling Joist
Framing
Figure 30: Wall Framing for Hole for Vertical
Installation.
well as above the roof line. The
galvanized nish is desirable
above the roof line, due to the
higher corrosion resistance.
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 down to the roof level, as
shown in Figure 31. Tighten the
clamp around the pipe section.
Use a level to make sure the
pipe is truly vertical. With
roong nails, secure the support
straps to the roof. Seal the nails
holes heads with non-hardening
mastic. Trim the excess length of
Initial Installation
QUALIFIED INSTALLERS ONLY
veRticaL instaLLation:
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.
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 31: Vertical Vent Termination Installation.
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