NuTone ILF120 Remote In-Line Fan with 4-Inch Duct Permanently lubricated motors and high pressure centrifugal blowers easily accommodate long duct runs and promote flexibility in system design Housing mounts directly to bracket and bracket mounts to rafters or joist for a quick and simple installation so you can move on with your day The in-line fan is backward inclined for strong air delivery with minimal noise and is suitable for use over a tub or shower when connected to a gfci-protected branch circuit making it perfect for so many areas in the home Durable polycarbonate plastic housing has an external rotor, ball bearing motor for many years of reliable service Switches sold separately so you can choose the right one for your installation and lifestyle (suitable for use with solid state speed controls)