appareil de protection respiratoire à adduction d'air

CONT: Les masques [filtrants] ne protègent pas contre l'oxyde de carbone. Ils ne remplacent pas les appareils respiratoires à alimentation d'air, c'est-à-dire qu'on ne peut les utiliser dans les endroits où la teneur d'oxygène de l'air est dangereusement faible.

CONT: Atmosphere-supplying Respirators. These provide a respirable atmosphere that is independent of the working environment. They may be classified in two ways: self-contained [and] Hose.
CONT: There are three types of respiratory protection: air-purifying respirators, supplied-air respirators and self-contained breathing apparatus. ... Supplied-air respirators provide breathable air from an outside source and protect against very toxic particulates and gases at high concentrations. They have a compressed air source and an air hose connecting the air source to the breathing mask. The respirators may have half facepieces, full facepieces, hoods or helmets and the oxygen is supplied by pressure demand or continuous flow.