Johnson Controllers Mechanical Temperature Controller A28AK-1C Two Stage Flange Mounted Duct, 2-SPDTThe A28AK is a two stage mechanical temperature control with special air coil sensing element and adjustable mounting flange.Features: Flat flange mounting with special coil element permits positioning of sensing bulb in the appropriate portion of the air stream2 SPDT snap-acting switchesunaffected by barometric pressure or cross ambient temperatures Product Specifications BRANDJohnson Controls CAPILLARY LENGTH FEETCoiled Capillary BULB SIZE INCHES-- MAXIMUM BULB TEMPERATURE °F (°C)140 (60) DIFFERENTIAL TEMPERATURE °F2 Ea. Stage, 3 Between Stages TEMPERATURE CONTROL RANGE °F30 to 110 VOLTAGE240 / 120 NEMA RATING1 STAGES2 SWITCH ACTION2 - SPDT TYPEHeat & Cool LISTING, RATING, CERTIFICATIONUL Listed LIMITED WARRANTY YEARS1 MANUFACTURER'S PART NUMBERA28AK-1C