Abstract: A protective breathing equipment for a crew member of an aircraft comprises a demand regulator supplied with pressurized oxygen and with dilution air taken from the living space of the crew. The regulator is connected to a breathing mask for the crew member. A protective hood supplied with filtered ventilation air is provided for location over the head of the crew member. The regulator has a housing containing the regulating mechanisms and an intake for dilution air and is surrounded by a case defining a protective space about the housing. The space is fed with filtered air under an overpressure of the same order as that which prevails in the hood.

Abstract: A respirator with an improved exhaust valve and a flexible face piece which conforms to the shape of the face of the wearer. The respirator is compact and principally formed of transparent material to minimize attention to the wearer.