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e. Ducts shall not serve both upper and lower
combustion air openings where both such
openings are used. The separation between
ducts serving the upper and lower combustion
air openings shall be maintained to the source
of combustion air.
f. Ducts shall not be screened where terminating
in an attic space.
g. Horizontal upper combustion air ducts shall
not slope downward toward the source of
combustion air.
h. For informational purposes, there are several
codes that address the amount of air and/or
size of the opening(s) in walls for combustion
air.
i. NFPA 54, National Fuel Gas Code (ANSI
Z223.1)
j. ASME CSD-1, Controls and Safety Devices for
Automatically Fired Boilers
k. ASME Section VI, Recommended Rules for
Care and Operation of Heating Boilers
l. BOCA, National Mechanical Code
WARNING
WARNING
Do not locate air intakes where petroleum distillates,
CFC's, detergents, volatile vapors or any other
chemicals are present. Severe boiler corrosion and
failure will result.
8. Ducted Combustion Air
a. Ducted combustion air can be connected to
the boiler air intake flange. Ducts shall be
constructed of galvanized steel or a material
having equivalent corrosion resistance,
strength and rigidity.
b. Table 4, Table 6, and Table 7 shall be used to
determine the ducted combustion air system
equivalent length.
c. Table Table 5 can be used for calculations.
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Thermal Solutions, 1175 Manheim Pike, Lancaster, PA 17601 Website: www.thermalsolutions.com
Phone: 717-239-7642 Fax: 877-501-5212 Email: sales@thermalsolutions.com
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