---
kind: "section"
citation: "42 C.F.R. § 84.175"
title: "42"
number: "84.175"
heading: "Instantaneous filter efficiency level determination test—PAPR series HE, PAPR100-N, and PAPR100-P filtration."
url: "https://uscodex.org/cfr/42/84.175"
---

# §84.175. Instantaneous filter efficiency level determination test—PAPR series HE, PAPR100-N, and PAPR100-P filtration.

- (a) 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/m 3 of DOP at the following continuous flow rates for a period of 5 to 10 seconds:
- (c) Powered air-purifying particulate respirators with multiple filter units will be tested by dividing the flow rate specified in [paragraph (b)](#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.

## Notes

### Source

Source: 85 FR 20608, Apr. 14, 2002, unless otherwise noted.

### Authority

Authority: 29 U.S.C. 651 et seq.; 30 U.S.C. 3, 5, 7, 811, 842(h), 844.

### Source

Source: 60 FR 30355, June 8, 1995, unless otherwise noted.