White 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 Certified. Grill Dimension: 10" x 9-1/2". Housing Dimension: 7-1/4" x 7-1/4" x 3-3/4".