VENTING & AIR INLET PIPING
6. Air Intake Pipe Location – Sidewall Venting:
a. Provide 1 foot (30 cm) clearance from the bottom
of the air intake pipe to the level of maximum
snow accumulation. Snow removal may be
necessary to maintain clearances.
b. Do not locate air intake pipe in a parking area
where machinery may damage the pipe.
c. If the vent pipe and air inlet pipe terminations
penetrate the wall at the same level the minimum
distance between them is 8" center-to-center.
d. For multiple boiler installations, the minimum
horizontal distance between the inlet of one boiler
to the exhaust of an adjacent boiler is 8" center-to-
center. In addition, the minimum vertical distance
between the exhaust and air inlet is 6". See Figure
3.1 for an illustration.
e. The exhaust outlet of the vent pipe should not be
angled any more than 5º from horizontal.
f. Precautions should be taken to prevent
recirculation of flue gases to the air inlet pipe of
the boiler or other adjacent appliances.
7. 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 4 feet (1.22 m)
clearance distance from any door, operable
window, or gravity air intake into any building.
• Provide a minimum of 6 feet (1.83 m)
clearance to adjacent facing walls.
• 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.
• 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 exhaust termination directly
under roof overhangs to prevent icicles from
forming or recirculation of exhaust gases from
occurring.
• Provide 3 feet clearance from the inside corner
of adjacent walls.
Figure 3.1: Vent Pipe Spacing for Multiple
P
UREFIRE
®
Boilers
Figure 3.2: Exit Terminal Location for Mechanical Draft and Direct-Vent Venting Systems
Condensing flue gases can freeze on exterior
building surfaces which may cause discoloration and
degradation of the surfaces.
CAUTION
9
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