Aprilaire 4166 Humidifier Replacement Knobs
Note: Manufacturer has discontinued this item. There are currently no replacement available at this time
The Aprilaire 4166 fits the following humidifier models:
- Aprilaire 440
- Aprilaire 445
- Aprilaire 445A
The Aprilaire 4166 Humidifier Replacement Knobs are replacement knobs, and attach to the front cover of the housing.
Each unit requires two knobs. Also referred to as door nuts.
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