A control relay with a twenty-four volt coil and one hundred twenty volt rated contacts interfaces with the lab exhaust fan status. A normally open relay closes upon fan startup. The associated damper remains in its last position upon the loss of signal.
M E RELAY WITH 24V COIL AND 120V RATED CONTACT. FAN STATUS DIRECTLY FROM LAB EXHAUST FAN. NORMALLY OPEN RELAY TO CLOSE WHEN FAN STARTS. DAMPER TO REMAIN IN LAST POSITION UPON LOSS OF SIGNAL
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