The Broan® ZB110 Ultra Green™ multi-speed ceiling bath fan gives a premium performance for today's demanding home ventilation requirements. 110 cu-ft/min quickly reduce humidity and manage moisture in bathrooms up to 105 sq-ft UltraSilent™ technology operates at the lowest sound rating achievable, less than 0.3 sones. The UltraSmart DC motor and control technology provides energy efficiency almost 10 times greater than ENERGY STAR requirements. With UltraQuick™ installation technology the ZB110 provides the fastest, easiest and most universal installation in remodel, retrofit and new construction. The Broan® ZB80 has been specifically designed to meet both spot and continuous ventilation needs for various building codes and green building standards. 110 cu-ft/min, effective ventilation to remove moisture and reduce the risk of mold or mildew in most full baths <0.3 sones for ultra quiet performance, you might not notice it's on UltraQuick™ installation technology uses an exclusive telescoping mounting frame with pre-installed screws Snap-in housing, snap-in blower and an inside out mounting duct connector for the fastest, easiest, most universal installation Mounting frame fits any type of joist, I-Joist or truss construction for a no guesswork installation to make the work fast and easy