Mich. Admin. Code R. 408.18181 - Ovens
Rule 8181.
(1)
With the exception of a range or cabinet type oven without moving parts
installed before November 16, 1974, a combustible fueled oven shall be provided
devices to protect against all of the following hazards:
(a) Ignition failure.
(b) Abnormal fuel pressure.
(c) Combustion air failure.
(d) Electrical power failure.
(e) Exhaust system failure.
(f) Excessive temperature.
(2) Preventilation purge shall be
arranged in the safety control circuit and set so as to require operation of
the exhaust and recirculating fans to provide not less than 4 complete oven
heating chamber air changes with fresh air before the burner ignition system
may be operated and fuel turned on.
(3) If a combustible fuel is used that is
heavier than air, a bottom exhaust system shall be provided and used during the
purge cycle.
(4) A direct-fired
oven installed after November 16, 1974, shall be equipped with relief vents for
freely relieving internal explosion pressures. The vents shall be proportioned
in the ratio of their area to the area of explosion containing volume of the
oven which shall be not less than 1 square foot of relief area to 30 cubic feet
of oven volume.
(5) All safety
controls shall be inspected not less than monthly as prescribed in Table 1
"Safety Control Inspection Guide for Washers and Ovens" of
R
408.18142(5).
Notes
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