These two part numbers are technically identical in specifications

This wheel is constructed from high-grade materials to withstand the thermal stresses and corrosive environments typical of gas-fired unit heaters

the limit switch will break the circuit to protect delicate components or sensors

The Reznor 123974 Fan Switch is a precise thermal control engineered for gas-fired unit heaters and duct furnaces

this kit is engineered to withstand the thermal cycling and pressure fluctuations common in HVACR and steam applications

Schneider Electric (Barber Colman) MK-3141 Pneumatic Damper Actuator Els PW 17895 These two part numbers areWhen the job requires a drop in Schneider Electric (Barber Colman) MK 3141 Pneumatic Damper Actuator, tech reliability is the only metric that matters. This proportional linear actuator is the direct replacement for the legacy MK 3140, engineered for modulating control of HVAC dampers and mixing boxes. Featuring a rugged die cast aluminum housing and a beaded molded neoprene rolling diaphragm, it manages a 3 to 13 psi spring range with a field