Minimize drying time with Spruce's SDB110P Dryer Boost Fan Kit. The Kit includes: Energy Star Rated RB110 Inline Fan, Mounting Bracket, Air Pressure-Sensing Switch, Probe, and Vinyl tubing. An air pressure sensing switch activates the fan when you dryer is in use. Mount the fan a minimum of 15 ft. away from the dryer to prevent wet lint from contacting the fan system. RB110: CFM @ 0" WC is 121. CFM @ 0.2" WC is 100.