Patent ID: 8842000

Claim:
A fan system comprising: a first facility fan; at least a second facility fan; a fan system controller configured to receive a first signal from an alarm system, wherein the alarm system is configured to transmit the first signal during a non-emergency condition and to cease transmission of the first signal upon detection of an emergency condition; a first link connecting the fan system controller to the first facility fan, wherein the fan system controller is configured to transmit a second signal to the first facility fan via the first link when receiving the first signal from the alarm system, and wherein the fan system controller is further configured to cease transmission of the second signal to the first facility fan in the absence of receiving the first signal from the alarm system; and a second link connecting the first facility fan to the second facility fan, wherein the second link is configured to transmit the second signal from the first facility fan to the second facility fan when the first facility fan is receiving the second signal from the fan system controller; wherein the first facility fan and the second facility fan are configured to operate when receiving the second signal, and wherein the first facility fan and the second facility fan are further configured to shut down in the absence of receiving the second signal.