The Broan 671 Bathroom Ventilation Fan features a durable 50-CFM blower wheel for consistent performance in any bathroom of your home. The fan operates at only 6.0 sones. Its compact polymer housing fits easily between ceiling joists or wall studs. Double-strength steel mounting flanges have keyhole slots for easy installation. Torsion spring grille mounting means that no tools are necessary. Housing Dimensions: 7.25L x 7.5W x 3.625H inches. Grille Dimensions: 9L x 9.25W inches.About Broan-NuTone Ventilation:Broan-NuTone has been leading the industry since 1932 in producing innovative ventilation products and built-in convenience products, all backed by superior customer service. Today, they"re headquartered in Hartford, Wisconsin, employing more than 3200 people in eight countries. They"ve become North America"s largest producer of residential ventilation products and the industry leader for range hoods, ventilation fans, and heater/fan/light combination units. They are proud that more than 80 percent of their products sold in the United States are designed and manufactured in the U.S., with U.S. and imported parts. Broan-NuTone is dedicated to providing revolutionary products to improve the indoor environment of your home, in ways that also help preserve the outdoor environment.