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17
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 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.
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
1
1
/
2
” (4cm) long
wood screw (x4)
10” (25.4cm) x 10” (25.4cm)
inside framing
Ceiling Joist
Framing
Figure 19: Wall Framing Hole for Vertical Installation.
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.
STEP 3. To install the Round Support Box/Wall Thimble
in a at ceiling, cut a 10 inch (25.4 cm) square
hole in the ceiling, centered in the hole drilled
in Step 2. Frame the hole as shown in Figure
19.
Vertical
Vent Cap
Roof
Truss
Insulation
Insulation
Guard
Ceiling
Rafter
Support
Collar
Storm
Collar
Roof Flashing
15 feet (4.57m)
Maximum
Vertical
Venting
Interior Wall
Surface
Insulation
Minimum
Clearance to
Combustibles
Exterior
Wall Surface
If installed
on a carpeted
surfacea hearth
is required
Figure 20: Vertical Installation.