This 4-blade aluminum propeller features a 35-degree pitch

Optimized Mechanical Balance: Precision-ground 1045 steel construction minimizes shaft whip and harmonic vibration across all blower speeds

this integrated control board fully supports the Smart System interface

making it a durable choice for mechanical equipment rooms and sensitive commercial ductwork applications

Verify 120V output from the control board before replacing to differentiate between a cracked element and a logic failure

Lochinvar & A.O. Smith 100173792 Arm Assembly 323080-701 This 4-blade aluminum propeller featuresThe Lochinvar & A. O. Smith 100173792 Arm Assembly is a critical OEM component designed for high efficiency burner management in commercial and residential gas fired systems. Engineered for precision and thermal stability, this gas air arm assembly ensures the correct orientation and alignment of the burner interface, which is essential for maintaining stoichiometric combustion and maximizing heat transfer. Built to withstand the harsh operating