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Air King America As50 Advantage 50 Cfm Ceiling Exhaust Fan, WhiteWhite polymeric grill. One piece polymeric wheel. Plastic collar for 3 duct connection, comes complete with built in non-metallic back draft damper for quiet operation. Rated for ceilings insulated to R-40. UL Listed for installation over a tub or shower on a GFCI circuit. HVI2100 Cer..