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d. 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.
e. 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
air and air inlet is 6". See Figure 3.1.
Figure 3.1: Vent Pipe Spacing for Multiple PureFire
Boilers
• DO NOT CONNECT air inlet pipes together.
Air inlet must be piped separately to prevent
drawing exhaust and/or moist condensate back
through the blower of an idle boiler.
• If multiple boilers are installed without piping
the air intake to outdoors, care must be taken
to be sure that the boiler room is well
ventilated and is not negatively pressurized
when the boilers or other air moving
equipment are in operation.
f. The exhaust outlet of the vent pipe should not be
angled any more than 5º from horizontal.
g. Precautions should be taken to prevent
recirculation of flue gases to the air inlet pipe of
the boiler or other adjacent appliances.
Figure 3.2: Exit Terminal Location for Mechanical Draft and Direct-Vent Venting Systems
VENTING & AIR INLET PIPING
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 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.
• 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.
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.
9
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