Axial Downblast Roof Exhaust Fan: Belt Drive, Includes Drive Pack, 20 in Blade, 3,957 cfm, ODP, 3 active noise-canceling circuitry to minimize
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Axial Downblast Roof Exhaust Fan: Belt Drive, Includes Drive Pack, 20 in Blade, 3,957 cfm, ODP, 3 active noise canceling circuitry to minimize active noise canceling circuitry to minimize external noise Sony's AINC technology analyzes outside noise and optimizes noise cancellation the polypropylene shell has an 18”wide seat designed to eliminate pressure points when sitting for long periods of time