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AIR FOR COMBUSTION AND VENTILATION
FORM 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 ceiling and one within
12" of floor on the wall connecting two spaces. (See Options 1 and 2 ) You can also remove door into
adjoining room. (See Option 3 )
WARNIN G
REWORK WORKSHEET, ADDING SPACE OF ADJOINING UNCONFINED SPACE. THE
COMBINED SPACES MUST HAVE ADEQUATE AMOUNT OF 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
total input ratings of all gas utilization equipment in confined space, but not less than 100 square inches.
Figure 6 Ventilation Air From Inside Building
A. Rework worksheet, adding space of an adjoining room. If the extra space provides an
unconfined space, remove door to adjoining room or add ventilation grills between rooms. See
“Air For Combustion And Ventilation From Inside Building”, figure 6.
B. Vent room directly to outdoors. See “Air For Combustion And Ventilation From
Outdoors”, page 14.
C. Install a lower BTU/Hr heater, if lower BTU/Hr size makes room unconfined.
If actual BTU/Hr used is less than maximum BTU/Hr space can support, space is an
unconfined space. You will need no additional fresh air ventilation.
WARNIN G:
YOU MUST PROVIDE ADDITIONAL VENTILATION AIR IN UNUSUALLY TIGHT
CONSTRUCTION
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