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Minimum Clearances – Indoor
The heater must have both combustion air and
ventilation air.
• Ventilation air opening 12"(305 mm) max from
the ceiling
• Combustion air opening 12"(305 mm) max
from the floor
All air from outdoors, each opening shall have a
net free area as shown in table.
Unrestricted
Opening
Model
Sq. In. (m
264
66 (0.04)
404
100 (0.06)
Check state and local codes before proceeding. Some states do not recognize the NFGC and require larger openings.
6
Typical
Screened or
Screened and
Louvered
Louvered
opening
)
Sq. In. (m
)
Sq. In. (m
2
2
99 (0.06)
132 (0.09)
150 (0.1)
200 (0.13)
Typical
opening
)
2
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