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The Aprilaire 4332 is a compatible part for the following humidifier models:
The Aprilaire 4332 Humidifier Damper Assembly is a damper assembly kit that includes a damper blade, spring, and knob. This Aprilaire humidifier kit is designed for Aprilaire humidifier models 400, 500, 550, and 600. This is a genuine Aprilaire part that will have your humidifier running at its factory operational setting resulting in cleaner indoor air. Aprilaire parts are made with high quality parts in order to ensure proper function for the consumer.
Aprilaire 4332 Humidifier Damper Assembly specifications: