AERCO Modulex EXT 1530 - 3060 - Manual (Page 40)

MODULEX EXT 1530, 1912, 2295, 2677, 3060 Boilers
Installation, Operation & Maintenance Manual
WARNING!
Fire danger due to flammable materials or liquids. Do not store
flammable materials and liquids in the immediate vicinity of the
boiler.
CAUTION!
See Section 3.7.2 for warnings and guidelines concerning materials
and contaniments that should be avoided in the boiler room and
near air inlets when operating the boiler.
3.21.2 Room Air Combustion
The boiler room shall be provided with two permanent openings communicating directly with an
additional room(s). The total input of all gas utilization equipment installed in the combined space
shall be considered in making this determination. Each opening shall have a minimum free area of
1 square inch per 1,000 Btu per hour of total input rating of all gas utilization equipment in the
confined space, but no less than 100 square inches. One opening shall commence within 12
inches (305 mm) of the top, and one opening shall commence within 12 inches (305 mm) of the
bottom of the enclosure. The minimum dimension of air openings shall not be less than 4 inches
(101.6 mm).
3.21.3 Sealed Combustion
The boiler room shall be provided with two permanent openings, one commencing within 12
inches (305 mm) from the top of the enclosure, and one commencing within 12 inches (305 mm)
from the bottom of the enclosure. The openings shall communicate directly, or by ducts, with the
outdoors or spaces (crawl or attic) that freely communicate with the outdoors. The minimum
dimension of air openings shall be no less than 4 inches (101.6 mm).
1. Where directly communicating with the outdoors, each opening shall have a minimum free area
of 1 square inch per 4,000 Btu/hr of total input rating of all equipment in the enclosure.
2. Where communicating with the outdoors through vertical ducts, each opening shall have a
minimum free area of 1 square inch per 4,000 Btu/hr of total input rating of all equipment in the
enclosure.
3. Where communicating with the outdoors through horizontal ducts, each opening shall have a
minimum free area of 1 square inch per 2,000 Btu/hr of total input rating of all equipment in the
enclosure.
4. Where ducts are used, they shall be of the same cross-sectional area as the free area of the
opening to which they connect.
Page 40 of 138 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0095_0E
12/01/14 Phone: 800-526-0288 GF-139