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Respirators usually are not needed in a pathology laboratory. However, they are required if formaldehyde exposure exceeds the action level of 0.5 ppm. Respirators, if required, must be provided to you at no cost.

Some OSHA-approved respirators include:
Air-purifying full-facepiece or half mask respirator equipped with a canister or cartridge approved for protection against formaldehyde. If a half mask is used, gas-proof goggles must also be worn.
Self-contained breathing apparatus operated in the demand mode or pressure-demand mode.