Air flow control system having minimum variation in volume

Details Air flow control system having minimum variation in volume Air flow control system having minimum variation in volume

1983-11-21

1985-11-12

Bennett, Henry

Pumps

With condition responsive pumped fluid control

Plural paths having individual condition responsive control...

417 12, 55215, 165 16, B64D 1300

Patent

active

045520585

ABSTRACT:
An air volume control ventilation system which minimizes variation in air volume flowing through the system has a fan for drawing air through fixed-resistance filter means including a roll filter, an electrostatic filter, and a high efficiency filter; a variable-resistance volume control damper operated, when an actuator therefor is energized in opposite directions, to open and to close and thus vary the volume of air flowing through the system; and a differential static pressure switch connected across the fan and being provided with a normally open high limit set of contacts adapted to close and complete a circuit to open the damper when the differential pressure across the switch rises to a first predetermined limit and also a low limit set of normally open contacts adapted to close and complete a circuit to shut the damper when the differential pressure falls below a second predetermined limit, whereby the damper is alternately open and shut and the differential pressure across the fan is maintained within a narrow band between the first and second limits.

REFERENCES:
patent: 4251027 (1981-02-01), DeHart et al.
patent: 4407185 (1983-10-01), Haines et al.

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