GAS FURNACE 100K BTU 21"

The RunTru A801X100CM5 is a 100,000 BTU input gas furnace designed for residential (or light‑commercial) heating of medium to large homes. HVACDirect +3 HVACDirect +3 Ferguson +3 It operates at 80% AFUE (Annual Fuel Utilization Efficiency), meaning about 80% of the fuel’s energy is turned into heating, with the rest lost via the flue and other normal losses. HVACDirect +2 Ferguson +2 It is a single-stage burner, meaning it only has one level of heat output (on/off), not variable or staged heating. HVACDirect +1 It uses a multi-position design, which means it can be installed in various orientations (upflow, downflow, horizontal) to adapt to different home layouts. Ferguson +2 HVACDirect +2 The blower motor is of the ECM (Electronically Commutated Motor) type, often “constant torque,” meaning more efficient motor control and more even airflow. crescentparts.com +1 It’s field‐convertible to propane (with optional LP kit) in many cases.