Hood assembly with noise filter

Details Hood assembly with noise filter Hood assembly with noise filter

A - Human Necessities

62

B

2/0.12, 2/0.14,

A62B 17/04 (2006.01) A62B 18/04 (2006.01)

Patent

CA 1124001

ABSTRACT An environmental control hood assembly includes a headpiece and a noise filter subassembly which is disposed within the headpiece adjacent its top wall. The filter subassembly includes a silencer member with an air-permeable wall portion and is connected to the conduit which in turn is connected to the source of air under pressure. The silencer member in turn is disposed within a foam member which is fabricated of an air-per- meable synthetic resin open cell foam so that air introduced into the silen- cer member must travel a path through the silencer member and through the foam with resultant reduction in the sound level of that air. A barrier may be provided under the silencer to preclude direct flow of air from the silencer downwardly through the foam, and the filter subassembly may in- clude a bottom sheet of an air-pervious material.

331712

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