The Delta BreezSlim SLM70D is a powerful compact sets the bar for performance in the popular small fan size of 7.5" x 7.25" x 3.94" . Operating at 2.0 sone, this quiet fan features DeltaÕs super reliable DC brushless motor, an LED indicator light so you know itÕs running, and a modern grille design. Perfect for retrofit into an existing space or for ceiling mount or wall mount installation (UL listed for both) into your next multifamily or single-family project. BreezSlim breaks the mold of the everyday bathroom exhaust fan. ENERGY STAR qualified with innovative brushless DC motor technology Quiet operation at 2.0 sones Compact housing for easy retrofit and replacement of older bath fans In humidity sensing mode, the fan will start when humidity is above 60%, and will stop when humidity is below 60% automatically Blue and Amber LED indicator light to show humidity sensor and full speed modes Detachable 3 inch diameter plastic duct adapter Built-in backdraft damper Motor equipped with thermal cutoff fuse Removable with permanently lubricated plug-in motor HVI, UL and CUL certified and can be used to comply with ASHRAE 62.2, CA Title 24 Three year warranty