Patent ID: 8087980

Claim:
An air-pressure-control system, the system comprising: a system inlet; a system outlet; a variable-speed fan configured to operate at a speed; a motor controller in communication with the fan and configured to control the speed of the fan; a differential-air-pressure transducer configured to monitor an air pressure differential between the system inlet and the system outlet; and a closed-loop controller in communication with the motor controller and the differential-air-pressure transducer, wherein the closed-loop controller is configured to vary the speed of the fan based on the pressure differential between the inlet and outlet of the system, thereby controlling a pressure within a space; and an interface in communication with the closed-loop controller and configured to receive a setpoint value, the closed-loop controller bringing the fan to full speed upon a change in condition within the space, the closed-loop controller then reducing the speed of the fan to obtain the setpoint value.