Heat-responsive duct closing method and apparatus

Details Heat-responsive duct closing method and apparatus Heat-responsive duct closing method and apparatus

1975-04-08

1976-11-09

Bell, Jr., Houston S.

Fluid handling

Processes

137 72, 98 1, 138 93, 169 48, 251 12, 251 611, 251DIG2, E03B 100

Patent

active

039904644

ABSTRACT:
A method and apparatus are disclosed for controlling the passage of air, smoke and noxious fumes through the heating and ventilating ducts of a building by means of a normally-collapsed, leak-proof bag which expands upon activation by smoke detection means to completely seal the duct from the passage of air and smoke.

REFERENCES:
patent: 3592207 (1971-07-01), Borello

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