Aprilaire 4640 Scale Control Insert 326058-756 this 100327096 blower motor reduces

this 100327096 blower motor reduces system vibration and prevents the blocked flue pressure switch from tripping

alongside a 1/4" pilot tap on the left

Featuring a DIN 43650 Form A connection

The three-pole configuration allows for complete circuit isolation

replacing the full S32421 Inducer Assembly is recommended to ensure the blower wheel and capacitor are also refreshed

Aprilaire 4640 Scale Control Insert 326058-756 this 100327096 blower motor reducesMaintaining your whole home humidification system requires precision engineered components like the Aprilaire 4640 Scale Control Insert. This genuine Aprilaire replacement part is specifically designed to encase the humidifier water panel, serving as a structural U shaped insert that guides water flow and manages mineral accumulation. Constructed from durable, heat resistant polypropylene, the 4640 insert effectively captures heavy scale buildup and