All workers requiring or wanting to use respiratory protection shall follow the requirements of Document 11.1. Respiratory protection shall be chosen by the ES

Table 4. Required respiratory protection.

Exposurea

Required Respirator

<0.2 µg Be/m3

None

<2.0 µg Be/m3 (<10 x AL)

Half-mask, negative-pressure respirator with P100 filter

<10 µg Be/m3 (<50 x AL)

Full-face, negative-pressure respirator with P100 filter or half-mask PAPRb with P100 filter

<20 µg Be/m3 (<100 x AL)

Full-face PAPR with P100 filter

<200 µg Be/m3 (<1000 x AL)

Supplied-air, full-face respirator operated in pressure demand mode

>200 µg Be/m3, unknown concentration, or firefighting