The Broan® Lo-Profile fan is our solution for installations where conventional ventilation simply won't fit. The LoProfile fan is narrow enough to be installed in a wall between 2x4 studs, such as multi-family applications. This Lo-Profile fan is the only exhaust ventilation fan on the market that features selectable CFM, between 50, 80, and 100 CFM and pre-installed continuous run that allows a user to set their low-speed mode between 30 and 100 CFM. This fan also features TRUE CFM™ which when installed the fan will not lose CFM performance regardless of how complicated the ducting. This bath fan meets ASHRAE 62.2 and is ENERGY STAR® certified.