PEERLESS PureFire PF-50 Installation, Operation & Maintenance Manual page 12

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. Maintain a minimum of 8" horizontal distance
between exhaust vent and the air intake.
Increasing this distance minimizes the potential for
contamination of the inlet air with exhaust.
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.
Figure 3.1: Vent Pipe Spacing for Multiple
P F ® Boilers
URE IRE
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.
Figure 3.2: Exit Terminal Location for Mechanical Draft and Direct-Vent Venting Systems
10
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.