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VENTILATION AIR
VENTILATION AIR FROM INSIDE BUILDING
This fresh air would come from an adjoining unconfined space. When venting to an adjoining
space, you must provide two permanent openings: one within 12" of the ceiling and one within
12" of the floor on the wall connecting the two spaces (see Options 1 and 2, Figure 8). You can
also remove door into adjoining room (see Option 3, in Figure 8).
WARNING
REWORK WORKSHEET, ADDING THE SPACE OF THE ADJOINING
UNCONFINED SPACE. THE COMBINED SPACES MUST HAVE ENOUGH FRESH
AIR TO SUPPLY ALL APPLIANCES IN BOTH SPACES.
NOTE: Each opening shall have a minimum free area of 1 square inch per 1000 BTU’s per
hour of the total input rating of all gas utilization equipment in the confined space, but not less
than 100 square inches.
Figure 8
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