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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.

GAS FURNACE 40K BTU 14"
The RunTru A801X040AM3SDBA is a 40,000 BTU, 80% Annual Fuel Utilization Efficiency (AFUE), single-stage, multi-position gas furnace. Designed for residential applications, it offers reliable heating solutions for homes with moderate heating demands. Its multi-position configuration allows for flexible installation in upflow, downflow, or horizontal orientations, accommodating various home layouts. The furnace is equipped with a multi-speed blower motor, enhancing comfort by providing consistent airflow and reducing temperature fluctuations. Additionally, it features a self-diagnostic control board for ease of maintenance and troubleshooting.
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