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 wirenuts 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: 10 in x 10 in One piece polymeric wheel. Rated for ceilings insulated to R-40. cULus Listed. HVI2100 Certified.