34 Pa. Code § 13.145 – Safety.

(a) The following shall conform to the safety standards of the Department:
1. (1) Power transmission machinery.
2. (2) Railings and toe boards.
3. (3) Stationary steam engines.
4. (4) Boilers.
5. (5) Ladders.
6. (6) Fire prevention plans and equipment.
7. (7) Elevators.
8. (8) Artificial lighting.
(b) When the provisions of this subchapter require it, the employer shall provide and renew when necessary, without cost to the employe, at least one reasonably effective respirator for each and every employe, and it shall be the duty of the employe to keep clean the respirator provided by the employer and to use such respirator at all times while at work.
(c) A respirator shall be considered efficient only when it fits the contour of the face and allows no air to enter the mouth or nose except air which has passed through the respirator. At least three thicknesses of gauze or cheese- cloth shall be considered an efficient respirator if such gauze or cheesecloth is thoroughly washed every day.