AERCO Esteem Boiler with EZ-Set Controller - Manual (Page 24)

GF-135
Esteem 399 Low NOx Boiler Chapter 2
OMM-0089_0A
Installation, Operation & Maintenance Manual Combustion Air/Venting
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:
• 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
• 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
Page 24 of 188 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0089_0A
MC1 06/19/14 Ph.: 800-526-0288