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" plastic duct collar with back draft damper insures quiet operation and prevents drafts from entering the room. White, polymeric grill. Dimensions: 10" x 10". One piece polymeric wheel. Rated forceilings insulated to R-40. cULus Listed. HVI2100 Certified.