VENTILATION AIR
VENTILATION AIR FROM INSIDE BUILDING
This fresh air would come from an adjoining unconfined space. When ventilating to an adjoin-
ing 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 6). You can also remove door into adjoining room (See option 3, Figure 6).
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 BTUs per
hour of the total input rating of all gas utilization equipment in the confined space, but not
less than 100 square inch.
12”OR 304.8MM
12” or
305 MM
Ventilation Grills Into Adjoining
Rooms, Option 2
Ventilation Grills Into Adjoin-
ing Rooms, Option 1
Or remove the
Door into Adjoin-
ing Room,
Option 3
FIGURE 6
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