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The NIOSH air filtration rating is the U.S. National Institute for Occupational Safety and Health ... 0.075 to 1.86 micron NaCl: PAPR100-N Rating discontinued Not yet
The 3M scale is known as microparticle performance rating (MPR) and measures the ability to filter particles 0.3 to 1 microns. [3] Although the standards measure slightly different attributes and thus, are not strictly convertible, one retailer reported the following typical equivalents: [3]
This is the point where oversized particles start to appear in high density and determines the rating for that material. [4] The reading is taken from the scale marked next to the grooves, in dimensionless "Hegman units" (or National Standard units; NS) and/or mils or micrometres . [ 5 ]
The micrometre (Commonwealth English as used by the International Bureau of Weights and Measures; [1] SI symbol: μm) or micrometer (American English), also commonly known by the non-SI term micron, [2] is a unit of length in the International System of Units (SI) equalling 1 × 10 −6 metre (SI standard prefix "micro-" = 10 −6); that is, one millionth of a metre (or one thousandth of a ...
HEPA filters are designed to arrest very fine particles effectively, but they do not filter out gasses and odor molecules. Circumstances requiring filtration of volatile organic compounds, chemical vapors, or cigarette, pet or flatulence odors call for the use of an activated carbon (charcoal) or other type of filter instead of or in addition to a HEPA filter. [20]
The Microparticle Performance Rating (MPR) is an air filter rating system created by the company 3M. It rates the ability of an air filter to filter out micro particles. Because MPR was created by 3M, it only applies to filters produced by the 3M brand. [1]
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