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Figure 15. Vertical concentric venting
Size pipes
according to
Table 1, p.
Cut a hole through the roof for an 8-inch combustion air
pipe. Fasten a length of 5-inch pipe to the exhaust
connection of the concentric adapter with sheet metal
screws. Use at least three screws per joint. Seal all joints
with high temperature silicone sealant. The concentric
adapter box is to be suspended from the underside of the
roof using suitable brackets (field-supplied). Before
mounting the box, cut a length of 8-inch pipe so that
dimension A (see
Figure 16, p.
roof thickness plus 18 inches or the roof thickness plus the
expected snow depth, whichever is greater. Fasten the
8-inch pipe to the combustion air inlet connection of the
concentric adapter and seal the joint. Add an additional
5-inch pipe to extend at least 20 inches above the top of the
8-inch pipe.
Insert the pipe through the roof and fasten the adapter box
in place (see
Figure 16, p.
Flash and/or caulk the 8-inch pipe to the roof (see
Figure 16, p.
23, Step 3).
Install the inlet air cap on the 8-inch pipe and fasten with
sheet metal screws. Install the flue terminal on the 5-inch
pipe and fasten in place. Seal the joint between the 5-inch
pipe and the inlet air cap with silicone sealant to prevent
the entry of water (see
Figure 16, p.
GMND-SVX01B-EN
10.
23, Step 1), is equal to the
23, Step 2).
23, Step 4).
Figure 16. Vertical concentric venting—installation
Connect the flue pipe and the combustion air pipe from the
concentric adapter to the unit. Pipe must be single wall
26-gauge or heavier galvanized steel or a material of
equivalent durability and corrosion resistance. Pipe
diameter must be as listed under inlet and flue size in
Table 1, p.
10. The equivalent length of the exhaust vent
pipe must be a minimum of 5 feet and a maximum of
50 feet. The equivalent length equals the total length of
straight pipe plus 15 feet for each 90-degree elbow and
5 feet for each 45-degree elbow. Secure each joint with a
minimum of three corrosion-resistant screws. Seal all
joints of the exhaust vent pipe with two full turns of 3M
#425 Aluminum Foil Tape or its equivalent suitable for
550°F or high temperature silicone sealant. Seal all joints
of the combustion air inlet pipe with two full turns of duct
tape or aluminum foil tape or silicone sealant. Do not
enclose the exhaust vent pipe or run the pipe within
6 inches of combustible material.
Installation: Piping
23
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