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9
Combustion Air and Ventilation Openings
All Air from Inside the Building
The closet 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
of the top, and one opening shall commence within 12
inches of the bottom of the enclosure. The minimum
dimension of air openings shall be not less than 3
inches.
All Air from Outdoor
The closet shall be provided with two permanent
openings, one commencing within 12 inches from the
top, and one commencing within 12 inches 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 3 inches.
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.
We reserve the right to make any changes due to technical modifications!
Installation, Operation and Maintenance Manual Sealed Combustion Gas Boiler Logano GA244 • Issue 02/2004
16
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
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