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What is Quantitative Respirator Fit Testing?

Cartoon scientist with half-mask respirator and proper face fit

Quantitative respirator fit testing measures how much air leaks into any tight-fitting respirators. Each quantitative fit test is performed by using a machine that calculates measurements with one of two methods: ambient aerosol (CNC) or controlled negative pressure (CNP). For nearly 30 years, there were only two manufacturers capable of performing the OSHA fit test […]