ENERGY STAR finish pack. Fan finish pack includes 4 motor or blower assemblies and 4 plastic grilles. Requires fan housing pack. 110 CFM, 0.7 sones quiet, energy efficient performance. cUL listed for use over tub or shower with GFCI circuit. Plug-in, permanently lubricated motor engineered for continuous operation. Dynamically balanced centrifugal blower wheel for quiet, efficient performance. Maintains a high percentage of rated CFM in less than ideal installations. Low RPM for quiet operation. Resilient anti-vibration motor mounts. Rugged, 26 gauge, galvanized steel construction. 6 inch round ducting for superior performance with damper foam to avoid clatter. Sturdy, easy, four-point mounting directly to joist. Includes unique spacers (patented) for mounting to engineered I joists. Can be mounted in ceilings up to 12/12 pitch. Hanger bars assembly included.