Protection in the workplace.
(i) Protection in the workplace. Requirements as specified in 721.63(a)(1), (2)(i), (3) through (5) and (6)(v) and (vi) (particulate), (b) (concentration set at 0.1%), and (c). When determining which persons are reasonably likely to be exposed as required for 721.63(a)(1) and (4), engineering control measures (e.g., enclosure or confinement of the operation, general and local ventilation) or administrative control measures (e.g., workplace policies and procedures.) shall be considered and implemented to prevent exposure, where feasible. For 721.63(a)(5), respirators must provide a NIOSH assigned protection factor of at least 50.