Fume hood controller

Details Fume hood controller Fume hood controller

1985-05-08

1987-11-17

Joyce, Harold

B08B 1502

Patent

active

047065532

ABSTRACT:
A fume hood controller system in which the sash position is monitored by a transducer which provides a signal indicative of the area of the hood opening. A variable speed motor controller is responsive to the sash position signal to provide a fan speed which varies in a substantially continuous and linear manner as a function of the sash opening. In an alternate embodiment, the air flow through the hood is controlled by a damper or similar device. Several embodiments are shown in which the present invention may be used to control a fume hood system in which a blower exhausts a plurality of fume hoods while maintaining a substantially constant face velocity in each hood.

REFERENCES:
patent: 4031819 (1977-06-01), Applewhite
patent: 4150606 (1979-04-01), Nelson
patent: 4160407 (1979-07-01), Duym
patent: 4517883 (1985-05-01), Levchenko et al.

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