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Code of Federal Regulations (Last Updated: July 5, 2024) |
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Title 42 - Public Health |
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Chapter I - Public Health Service, Department of Health and Human Services |
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SubChapter G - Occupational Safety and Health Research and Related Activities |
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Part 84 - Approval of Respiratory Protective Devices |
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Subpart K - Air-Purifying Particulate Respirators |
§ 84.175 - Instantaneous filter efficiency level determination test - PAPR series HE, PAPR100-N, and PAPR100-P filtration.
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§ 84.175 Half-mask facepieces, full facepieces, hoods, helmets, and mouthpieces; fit; minimum requirementsInstantaneous filter efficiency level determination test - PAPR series HE, PAPR100-N, and PAPR100-P filtration.
(a) Half-mask facepieces and full facepieces shall be designed and constructed to fit persons with various facial shapes and sizes either:
(1) By providing more than one facepiece size; or
(2) By providing one facepiece size which will fit varying facial shapes and sizes.
(b) Full facepieces shall provide for optional use of corrective spectacles or lenses, which shall not reduce the respiratory protective qualities of the respirator.
(c) Hoods and helmets shall be designed and constructed to fit persons with various head sizes, provide for the optional use of corrective spectacles or lenses, and insure against any restriction of movement by the wearer.
(d) Mouthpieces shall be equipped with noseclips which are securely attached to the mouthpiece or respirator and provide an airtight seal.
(f) Half-mask facepieces shall not interfere with the fit of common industrial safety corrective spectacles(e) Facepieces, hoods, and helmets shall be designed to prevent eyepiece fogging.
Three filters from each powered air-purifying particulate respirator for efficiency will be tested against a neat cold-nebulized dioctyl phthalate (DOP) or equivalent aerosol at 25 ± 5 °C that has been neutralized to the Boltzmann equilibrium state.
(b) Single air-purifying particulate respirator filter units will be tested in an atmosphere concentration of 100 mg/m3 of DOP at the following continuous flow rates for a period of 5 to 10 seconds:
Type of respiratory inlet
coveringAirflow rate
(liters per
minute)Tight-fitting 115 Loose-fitting 170 (c) Powered air-purifying particulate respirators with multiple filter units will be tested by dividing the flow rate specified in paragraph (b) of this section by the total number of filters used.
(d) The filter will be mounted on a connector in the same manner as used on the respirator and the total efficiency must be ≥99.97 percent.