Respiratory Protection

Identify the contaminant

Particles (dust, fume, mist) need particle filters such as EN 149 FFP masks or EN 143 P filters. Gases and vapours need EN 14387 gas filters of the correct type, e.g. A for organic vapours or B for H2S. Many tasks need a combined filter such as ABEK1-P3.

Required protection factor

Compare measured concentration with the exposure limit to find the protection factor required. FFP3 and P3 half masks give more protection than FFP2; full face masks (EN 136) and TH3 powered respirators (EN 12941) give more again.

Oxygen deficiency and IDLH

For confined spaces, tank entry, H2S release or fire, use SCBA (EN 137) or airline equipment (EN 14594) with breathing air meeting EN 12021. Escape sets (EN 1146) are for escape only.

Fit and facial hair

Tight-fitting masks need a fit test for each wearer and a clean-shaven seal area. Where beards are worn, or heat makes tight masks hard to tolerate, use loose-fitting powered or supplied-air hoods.

Heat and work rate