BOILER BOOK CFC-E ENGINEERING DATA
35
Figure 27. Two Opening Outside Wall Method
B. All Air From Outdoors - If all combustion air will be received from outside the building (the
mechanical room equipment is linked with the outdoors), the following methods can be used:
1. Two Opening Method (Figure 27) - The mechanical equipment room must be provided
with two permanent openings, one terminating within twelve inches from the top, and one
opening terminating within twelve inches of the bottom of the room.
2. The openings must be linked directly or by ducts with the outdoors.
3. Each opening must have a minimum free area of one square inch per 4,000 Btu per hour
of total input rating of all equipment in the room, when the opening is directly linked to
the outdoors or through vertical ducts.
4. The minimum free area required for horizontal ducts is one square inch per 2,000 Btu per
hour of total input rating of all the equipment in the room.
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