Equipment for respiratory protection against pollutants

Details Equipment for respiratory protection against pollutants Equipment for respiratory protection against pollutants

A - Human Necessities

62

B

A62B 7/10 (2006.01) A62B 18/00 (2006.01)

Patent

CA 2076408

An Equipment for respiratory protection against pollutants, for use at low altitude comprises a face cover fitted with an atmospheric air supply comprising a filter, a rotary fan to compensate for the head loss due to the filter, and a flexible hose, as well as a self-contained electric power source for energizing the rotary fan, supplying a rated voltage V0. The fan supplies, under its rated voltage V0, an air flow rate higher than that neces- sary for the wearer when the latter is in rest condition, but far lower than the air flow rate required in case of abnormal activity. A pressure sensor causes a temporary increase in the voltage applied to the fan when the over- pressure prevailing in the face cover with respect to the surrounding is lower than a predetermined value.

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