[. . . ] [. . . ] The Duct Airstat can be used to initiate such auxiliary devices as: Duct Boosters, Electronic Air Cleaners, Electrical Duct Heaters, and Humidifiers. The electrical contacts of the switch are closed upon sensing positive air pressure generated by the blower. TYPICAL APPLICATIONS Duct Airstat Duct Booster Electronic Air Cleaner Electronic Duct Heater Humidifier GENERAL SPECIFICATIONS ELECTRICAL RATING: 278 VA Pilot Duty at 24 Volts AC 300 VA Pilot Duty at 115 to 277 Volts AC 15 AMPS Non-Inductive to 277 Volts AC ELECTRICAL SWITCH: SPST, N/O, Snap Action Contacts, Non Adjustable OPERATING PRESSURE / POSITION: On pressure rise at +. 05 + . 02" W. C. (Diaphragm Vertical) MAXIMUM PRESSURE: 1/2 PSI OPERATING TEMPERATURE RANGE: -40 to 1900 F. SAMPLING TUBE: Self-sealing, factory mounted tube DIMENSIONS: 5" Diam. , 5 1/2" Across Bracket, 3" High 115-120V FEATURES High Sensitivity Maximum Temperature Limit of 1900 F. [. . . ] [. . . ]