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Exhaust fans that are part of a mechanical smoke removal system shall be rated for operation at 221°F (105°C). Exhaust fan motors shall be located outside of the exhaust fan air stream.
Except where specific construction specifications are prescribed in this section, hoods, ducts, elbows, fans, blowers, and all other exhaust system ...
Clearance from the duct or the exhaustfan to the interior surface of enclosures of combustible
construction shall be not less than 18 inches (457 mm ...