Part 4; Venting; General; Approved Materials For Exhaust Vent And Intake Air Pipe - Heat Transfer MUNCHKIN Operating Manual

PART 4. VENTING
A. GENERAL
1. Install the boiler venting system in accor-
dance with these instructions and with the
National Fuel Gas Code, ANSI Z223.1/NFPA
54, CAN/CGA B149, and/or applicable provi-
sions of local building codes.
2. This boiler is a direct vent appliance and is
listed as a Category IV appliance with
Underwriters Laboratories, Inc. VENT AND
INTAKE AIR PIPE
WARNING
This vent system will operate with a positive
pressure in the pipe. Do not connect vent
connectors serving appliances vented by natural
draft into any portion of mechanical draft systems
operating under positive pressure.
WARNING
Follow these venting instructions carefully. Failure
to do so may result in severe personal injury, death,
or substantial property damage.
B. APPROVED MATERIALS FOR EXHAUST
VENT AND INTAKE AIR PIPE
1. Use only Non Foam Core venting material.
The following materials are approved for use
as vent pipe for this boiler:
a. Non Foam Core PVC (Polyvinyl Chloride)
Pipe conforming to ASTM D-1784 Class
12454-B (formerly designated Type 1, Grade
1).
b. Non Foam Core CPVC (Chlorinated Polyvinyl
Chloride) Pipe conforming to ASTM D-1784
Class 23447-B (formerly designated Type IV,
Grade 1).
c. Non Foam Core ABS (Acrylonitrile-
Butadiene- Styrene) Pipe conforming to
ASTM D3965 Class 3-2-2-2-2.
WARNING
Do not use Foam Core Pipe in any portion of the
exhaust piping from this boiler. Use of Foam Core
Pipe may result in severe personal injury, death, or
substantial property damage.
2. Cellular foam core piping may be used on air
inlet piping only. Never use cellular foam core
material for exhaust piping.
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C. EXHAUST/VENT / AIR INTAKE PIPE
LOCATION
1. Determine exhaust vent location:
a. The vent piping for this boiler is approved for
zero clearance to combustible construction.
b. See Figure 4.1 for an illustration of clear-
ances for location of exit terminals of direct-
vent venting systems.
c. This boiler vent system shall terminate at
least 3 feet (0.9 m) above any forced air
intake located within 10 ft (3 m). Note: this
does not apply to the combustion air intake
of a direct-vent appliance.
d. Provide a minimum of 1 foot distance from
any door, operable window, or gravity intake
into any building.
e. Provide a minimum of 1 foot clearance from
the bottom of the exit terminal above the
expected snow accumulation level. Snow
removal may be necessary to maintain
clearance.
f. Provide 4 feet horizontal clearance from
electrical meters, gas meters, gas regulators,
and relief equipment. In no case shall the
exit terminal be above or below the afore-
mentioned equipment unless the 4 foot hor-
izontal distance is maintained.
g. Do not locate the exit terminal over public
walkways where condensate could drip
and/or freeze and create a nuisance or haz-
ard.
h. When adjacent to a public walkway, locate
exit terminal at least 7 feet above grade.
i. Do not locate the exit termination directly
under roof overhangs to prevent icicles
from forming.
j. Provide 3 feet clearance from the inside cor-
ner of adjacent walls.
2. Determine air intake pipe location.
a. Provide 1 foot clearance from the bottom of
the air inlet pipe and 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. When venting with a two pipe system, max-
imum distance between air intake and
exhaust vent is 6 feet (1.8 m). Minimum dis-
tance between exhaust vent and air intake
on single boiler is 8" (0.2 m) center-to-cen-
ter. Minimum distance between vents and
intakes on multiple boilers is 8" (0.2 m) cen-
ter-to-center. See Figure 4.2.

VENTING