Tour Lab Chemical Hygiene Plan, p. 9 NIOSH ( C ONTROL M EASURES AND E QUIPMENT J ANUARY 17, 2012
R ESPIRATORS Respirators should be worn employees might be exposed to vapor or particulate concentrations greater than the PEL, TLV, or similar limit. Work with toxic chemicals that have low air concentration limits, or that have high vapor pressures, should always be done in a hood
Simplest, least expensive, least protective Only protect against particles N-95 is most common, used in hospitals to protect against infection agents R ESPIRATORS Particulate respirators
Chemical Cartridge/Gas Mask respirators Also known as "air-purifying respirators" Includes a facepiece or mask, and a filter/cartridge R ESPIRATORS