What is the purpose of the manual lift stem

serving as a direct replacement part

Featuring a 13 3/16 inch diameter and 12 5/8 inch width

this 3000-3300 RPM shaded-pole motor ensures proper draft for safe combustion and exhaust cycles

As an official part from Nortek Global HVAC

Williams P323663 Safety Switch 340155-7026 What is the purpose ofThe Williams P323663 Safety Switch is a critical OEM vent limit protection component designed to maintain the operational safety of your gas fired heating equipment. Engineered as a safety limit switch for Williams wall furnaces and vented room heaters, this part features a high precision sensor that triggers at a fixed 200F temperature. When the exhaust gases in the vent reach this thresholdoften due to a blocked flue or inadequate draftthe switch