Air Sensing Switch, HVAC/General Purpose Type, 0.02 to 0.8 Differential (In. WC), SPDT/ OVERALL LENGTH: 3.875 INCHES NOMINAL OVERALL HEIGHT: 6.125 INCHES NOMINAL OVERALL WIDTH: 3.062 INCHES NOMINAL PRESSURE SWITCH TYPE: DIFFERENTIAL OPERATING TEMP RATING: -40.0 DEG FAHRENHEIT MINIMUM AND 180.0 DEG FAHRENHEIT MAXIMUM MOUNTING METHOD: BRACKET CONTACT ACTION STIMULUS: INCREASE NONPILE-UP CONTACT ARRANGEMENT: 1 POLE, DOUBLE THROW, ONE POSITION MOMENTARY TERMINAL TYPE: FERRULE CONTACT LOAD CURRENT RATING: 1.1 AMPERES RESISTIVE LOAD FIRST VOLTAGE CONTACT LOAD CURRENT RATING: 2.5 AMPERES RESISTIVE LOAD SECOND VOLTAGE CONTACT ADJUSTABILITY: DEACTUATION POINT ADJUSTABLE AND ACTUATION POINT ADJUSTABLE CONTACT ADJUSTMENT RANGE: 0.07 TO 12.00 ACTUATION POINT INCHES OF WATER AND 0.07 TO 12.00 DEACTUATION POINT INCHES OF WATER CONTACT ADJUSTMENT TYPE: EXTERNAL DEACTUATION POINT KNOB AND EXTERNAL ACTUATION POINT KNOB CONTACT VOLTAGE RATING IN VOLTS: 277.0 AC AT SEA LEVEL FIRST VOLTAGE CONTACT VOLTAGE RATING IN VOLTS: 120.0 AC AT SEA LEVEL SECOND VOLTAGE MEDIA FOR WHICH DESIGNED: GAS STYLE DESIGNATOR: 34 RECTANGULAR W/BRACKET