Mich. Admin. Code R. 325.52006 - Direct-fired air heaters
Rule 6.
(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 permissible exposure limits 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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