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...wo rooftop ventilators in the shop working together replace the air in the room in about 30 minutes, assuming the air is well mixed. Sweeping the shop floo Wear an N-95 mask at a minimum. Better is a P-100 dust mask. Chemical respirators are not necessary in this shop. Here are some of the hazards yo

...wo rooftop ventilators in the shop working together replace the air in the room in about 30 minutes, assuming the air is well mixed. Sweeping the shop flo Wear an N-95 mask at a minimum. Better is a P-100 dust mask. Chemical respirators are not necessary in this shop. Here are some of the hazards y