Damper control for preventing spread of fire and smoke through a

Details Damper control for preventing spread of fire and smoke through a Damper control for preventing spread of fire and smoke through a

1979-01-08

1980-02-19

Wayner, William E.

Automatic temperature and humidity regulation

Mixing fluid of dissimilar temperature

Plenum type

236 49, G05D 2313

Patent

active

041890922

ABSTRACT:
Upon sensing an excessive temperature in a plenum supplying secondary air to a mixing box, a thermostatic element opens a valve to exhaust air from a pneumatic actuator for opening a normally closed secondary air damper. This action permits the damper to close and so prevent flow of secondary air from the plenum into the mixing box. The control may be tested by applying auxiliary heat to the thermostatic element. The control may be made to prevent spread of smoke by making the application of heat to the thermostatic element responsive to a smoke detector.

REFERENCES:
patent: 3720258 (1973-03-01), Chandler
patent: 3823870 (1974-07-01), Chandler
patent: 3883071 (1975-05-01), Meckler
patent: 3912223 (1975-10-01), Iwata
patent: 4073433 (1978-02-01), Modes
patent: 4084744 (1978-04-01), Wilson, Jr.
patent: 4086781 (1978-05-01), Brody et al.
patent: 4148435 (1979-04-01), Meyers et al.

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