Deconstructed
Inside the Air Sterilizer

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Below is shown an 8 Inch to 7 Inch HVAC reducer.

The light that comes through the gap between the outside perimeter of the double fan and the fan housing is cutoff by the reducer.

The inside of the reducer is coated with a black rubber coating that absorbs any UV light that squeezes through the gap.

Fan Housing

8" to 7" Reducer