The high-performance exhaust fan Series feature a unique snap-in-installation system. Installs in ceiling. The durable high-impact plastic housing ensures quiet operation and maximum performance. Motors are suitable for continuous operation. Includes wire nuts and Romex connector. 4 in plastic duct collar with back draft damper insures quiet operation and prevents drafts from entering the room. White, polymeric grill. Dimensions of 10 in x 10 in. One-piece polymeric wheel. Rated for ceilings insulated to R-40. cULus listed. HVI2100 certified.