Motor operated fire damper

Details Motor operated fire damper Motor operated fire damper

1982-11-29

1984-02-21

Wayner, William E.

Automatic temperature and humidity regulation

Thermostatic

Expanding solid

236 49, F24F 700

Patent

active

044322720

ABSTRACT:
A fire and smoke damper having an electric motor coupled with the damper to hold the damper blades open when the motor is energized. A spring associated with the motor provides torque for closing the blades when the supply of electrical energy to the motor is interrupted. A thermal responsive electrical switch is mounted on the damper and incorporated in the electric circuit which supplies energy to the motor so that the motor is de-energized and the damper is closed when the ambient temperature reaches a predetermined level.

REFERENCES:
patent: 4039123 (1975-08-01), Frankel

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