You should always replace components with the exact OEM specification

The 391937 and 391937/U are the same Honeywell/Resideo conversion kit

specifically approved for use in fire and energy management systems

Single Phase Efficiency: Permanent split capacitor (PSC) design provides consistent torque for light-duty blower and fan applications

Bray Commercial DM24-140 Actuator Refrigerant You should always replace componentsThe Bray Commercial DM24 140 Actuator is a high performance direct coupled actuator designed for the precise modulation of dampers and valves in demanding HVAC environments. Built for reliability, this 24VAC DC HVAC actuator provides a robust 140 lb in torque output, ensuring consistent control over medium to large air handlers and terminal units. It utilizes a versatile proportional control signal, accepting 2 10VDC or 4 20mA inputs to match various