GF-135
Esteem 399 Low NOx Boiler
Chapter 2
OMM-0089_0A
Installation, Operation & Maintenance Manual
Combustion Air/Venting
Page
24
of
188
AERCO International, Inc.
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100 Oritani Dr.
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Blauvelt, NY 10913
OMM-0089_0A
MC1 06/19/14
Ph.: 800-526-0288
3.5.2.2 Option 2: Two Permanent Openings to Outside
Two permanent openings, one commencing within 12 inches of the top and one commencing
within 12 inches of the bottom of the enclosure, shall be provided. The openings shall
communicate directly, or by ducts, with the outdoors or spaces that freely communicate with the
outdoors, as follows:
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Where directly communicating with the outdoors or where communication to the outdoors
is through vertical ducts, each opening shall have a minimum free area of 1 sq. in./4000
Btu/hr. of total input rating for all equipment in the enclosure. See Figure 3-3.
Figure 3-3: All Combustion Air from Outdoors Through Ventilated Attic
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Where communicating with the outdoors is through horizontal ducts, each opening shall
have a minimum free area of not less than 1 sq. in./2000 Btu/hr. of total input rating of all
equipment in the enclosure. See Figure 3-4.
Figure 3-4: All Combustion Air from Outdoors Through Horizontal Ducts
