Air Sensing Switch, Manual Reset, Differential (In. WC) 0.06 to 0.6, SPST Switch Type, Pressure Setting Range (In. WC) 1 to 12.0, Electrical Rating 15A Noninductive 120-277V AC, Sample Line Connector 1/4 in OD, Height (In.) 6 1/8 in, Width (In.) 3 1/4 in, Depth (In.) 3 1/4 in, Mounting Holes O.C. (In.) 3 7/8 in, Vertical, Operating Temp. Range (F) -40 to 180, Requiring Safety Lock Out of The Fan, Features Proof of Flow, High Limit Cut Out, Filter Dirty Indication