§ 35.94. Fans and ducts.
(a) Where fans are equipped with baffles that produce four or more 180 degree turns in the direction of the exhaust air, and where spraying is continuous, fans and exhaust ducts shall be examined at least weekly. They shall be kept clean and free from the accumulation of sprayed materials.
(b) Where there are no baffles nor distributing plates in front of fans, all fans and exhaust ducts shall be examined daily, and shall be kept clean and free from accumulation of sprayed materials.
(c) No employe shall enter exhaust ducts for the purpose of examining, cleaning, or repairing until the ducts are free from flammable vapors.
(d) Nothing in this Subchapter shall be construed to require the frequent cleaning of fans in installations using the induced draft principle.
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