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Installation: Piping
Figure 13. Horizontal concentric venting
The location of the vent terminal must be in accordance
with the National Fuel Gas Code ANSI Z223.1 in the U.S. or
the National Gas Installation Code CAN/CGA-B149.1 or the
Propane Gas Installation Code CAN/CGA-149.2 in Canada.
Minimum clearance are as follows:
Table 6.
Horizontal concentric venting—minimum
clearance
Object
U.S.
Forced air inlet within
3 feet above
10 feet
4 feet below
Door, window or gravity
air inlet or combustion air
4 feet horizontally
inlet for other appliance
1 foot above
Adjacent public walkways 7 feet above grade 7 feet above grade
Above grade level
1 foot
In Canada, a vent shall not terminate above a meter/
regulator assembly within 3 feet horizontally of the
vertical center line of the regulator nor within 6 feet of any
gas service regulator vent outlet.
Cut a hole through the wall for an 8-inch combustion air
pipe. Install thimble if required by local codes or type of
wall construction (see
Figure 14, p.
Fasten a length of 5-inch pipe to the exhaust connection of
the concentric adapter with sheet metal screws. Use at
least three corrosion-resistant screws per joint. Seal all
joints with high temperature silicone sealant. The
concentric adapter box may be fastened directly to the wall
or spaced away from the wall using suitable brackets
(field-supplied). Before mounting the box, cut a length of
8-inch pipe so that it will protrude 2 inches through the
wall when the box is mounted in position. 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, if necessary, so that the base of the exhaust cap
will be 16 to 24 inches from the combustion air inlet (see
Figure 14, p.
22, Step 2).
22
Size pipes
according to
Table 1, p.
10.
Minimum Clearance
Canada
6 feet
12 inches for
100,000 Btu/h input
or less. 3 feet for
input exceeding
100,000 Btu/h.
1 foot
22, Step 1).
Insert the pipes through the wall and fasten the adapter
box in place. Flash and/or caulk 8-inch pipe on outside wall
(see
Figure 14, p.
22, Step 3).
Install the inlet air screen on the 8-inch pipe and fasten with
sheet metal screws. Install the flue terminal on the 5-inch
pipe and fasten in place (see
Figure 14. Horizontal concentric venting—installation
Connect the flue pipe and the combustion air pipe from the
concentric adapter to the unit. The pipe must be single wall
26-gauge or heavier galvanized steel or a material of
equivalent durability and corrosion resistance. The pipe
diameter must be listed under inlet and flue size in
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.
Vertical Termination
Select a location on the roof for the vent terminal, ensuring
adequate space inside for the concentric vent box. The
terminal must be at least 6 feet from any wall or adjoining
building (see
Figure 15, p.
Figure 14, p.
22, Step 4).
Table 1,
23).
GMND-SVX01B-EN
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