Section 47.66. Dust

(a) Dust or stive rooms shall not be used. A fan discharging dust shall discharge either to the outer air at such points where the dust may not reenter the mill or an adjacent building, or to a dust collector, and the air vent or outlet to every cyclone dust collector shall discharge to the outer air or to another dust collector. All tubular dust collectors, shall be maintained in a proper state of repair to prevent leakage of dust into the room. A fan, which discharges into any dust collector, shall be kept in operation at all times while the machine or machines with which it is connected are in operation. There shall be no direct connection between dust collectors and boiler rooms or incinerators. This requirement applies to malt house elevators.

(b) Mills and all buildings, structures, and elevators used in connection with the operation of mills shall be kept thoroughly clean and free from dust. Dust shall be removed from floors and machinery daily, and all other parts of the mill, including fixtures, bearings, ledges, projections, side walls and ceilings, and all buildings, structures and elevators, shall be kept free from all accumulation of dust. This requirement also applies to malt house elevators.