Instantaneous filter efficiency level determination test—PAPR series HE, PAPR100-N, and PAPR100-P filtration.
Effective Apr 14, 2020
- (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:
| Type of respiratory inlet covering | Airflow 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.