Mich. Admin. Code R. 325.2435 - Direct-fired air heaters
Rule 35.
(1) A
direct-fired air heater, wherein combustion products are released in the supply
air stream, may be installed in buildings of industrial occupancy, garages,
laundries, and commercial kitchens. They shall not be installed in offices,
schools, hospitals, and places of public assembly.
(2) A direct-fired air heater shall have an
inlet duct connected directly to the out-of-doors. Room air shall not be
circulated across the burner.
(3) A
direct-fired air heater shall deliver air which contains not more than 10 ppm
of carbon monoxide and is free from odors of combustion products. Permissible
concentrations of other contaminants in the delivered air may be established by
the director pursuant to their MAC and the degree of exposure to a
person.
(4) The air volume supplied
to the building by a direct-fired air heater shall not exceed 110% of the total
air volume exhausted. The director may require interlocking of a heater control
system with an exhaust ventilation system if necessary to ensure that the
exhaust systems are operating.
(5)
A direct-fired air heater shall have both of the following:
(a) A pre-ignition purge of fresh
air.
(b) A positive fuel supply
closure in the event of fuel supply failure, ignition failure, flame failure,
power failure or interruption, or air flow reduction below 50% of its rated
capacity.
Notes
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