Air purifying respirators use ambient air and cannot be used in oxygen deficient atmospheres, IDLH atmospheres, or areas where the identity or concentration of a contaminant is unknown. Ambient air is purified by a chemical cartridge, canister, or particulate filter. Cartridges and canisters must be replaced if the user notices an odor, taste, or throat irritation. Disposable or single-use respirators are made of cloth or paper and are primarily used for nuisance dusts. Filter or dust respirator becomes damaged, visibly dirty, wet, or contaminated on the inside.
Fullface mask covers the face from the hairline to below the chin.
This type of mask provides eye protection. Half-face mask covers the face from above the nose to below the chin. Selecting a Respirator. If an oxygen deficient atmosphere is known or suspected. If an IDLH condition exists.