Photo 1 of Air King 9166F 20" Whole House Window Fan-----------missing power knob unable to test --------------

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Photo 1 of Air King 9166F 20" Whole House Window Fan-----------missing power knob unable to test -------------- Photo 2 of Air King 9166F 20" Whole House Window Fan-----------missing power knob unable to test -------------- Photo 3 of Air King 9166F 20" Whole House Window Fan-----------missing power knob unable to test -------------- Photo 4 of Air King 9166F 20" Whole House Window Fan-----------missing power knob unable to test -------------- Photo 5 of Air King 9166F 20" Whole House Window Fan-----------missing power knob unable to test --------------