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VENTING & AIR INLET PIPING
Figure 3.1: Vent Pipe Spacing for Multiple
P
F
Boilers
URE
IRE
6. Sidewall Venting Configuration:
a. See Figure 3.2 for an illustration of clearances for
location of exit terminals of direct-vent venting
systems.
• This boiler vent system shall terminate at least
3 feet (0.9 m) above any forced air inlet
located within 10 ft (3 m). Note: This does not
apply to the combustion air intake of a direct-
vent appliance.
• Provide a minimum of 1 foot (30 cm) distance
from any door, operable window, or gravity
intake into any building.
• Provide a minimum of 1 foot (30 cm)
clearance from the bottom of the exit terminal
above the expected snow accumulation level.
Snow removal may be required to maintain
clearance.
Figure 3.2: Exit Terminal Location for Mechanical Draft and Direct-Vent Venting Systems
6
• Provide a minimum of 4 feet (1.22 m)
horizontal clearance from electrical meters, gas
meters, gas regulators, and relief equipment. In
no case shall the exit terminal be above or
below the aforementioned equipment unless
the 4 foot horizontal distance is maintained.
• Do not locate the exhaust exit terminal over
public walkways where condensate could drip
and create a hazard or nuisance.
• When adjacent to public walkways, locate the
exit terminal at least 7 feet above grade.
• Do not locate the exit termination directly
under roof overhangs to prevent icicles from
forming.
CAUTION
Condensing flue gases can freeze on exterior
building surfaces which may cause discoloration and
degradation of the surfaces.
• Provide 3 feet clearance from the inside corner
of adjacent walls.
b. Figure 3.3 and 3.4 show approved sidewall
venting configurations using the standard fittings
supplied.
c. Figure 3.5 and 3.6 show approved sidewall
venting configurations using optional vent
termination kits.
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