Air flow control system having minimum variation in volume
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United States of America Patent
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-
Nov 12, 1985
Grant Date -
N/A
app pub date -
Nov 21, 1983
filing date -
Nov 21, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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