Air King AIDB4Y Inline Dryer Booster FanThe Air King Dryer Booster Fan is the Solution when Extended Lengths of Ducting are Required for the Exhaust of the Dryer. Unfortunately not Every Dryer can be Placed on an Exterior Wall and Vent Directly Out of the Home with Little to Almost No Ducting. The Air King Dryer Booster Fan can be What Makes the Difference Give Your Dryer the Boost it Needs for Effective and Efficient Operation. Constructed of Ul-Recognized and UV-Protected Thermoplastic Resin and is Prewired for Quick and Easy Installation Suitable for Most Dryer Boosting Applications and can Generally be Used for a Maximum of 60 Linear Feet of Ducting with a Maximum of Six Elbows Using 4Andqout; Rigid Ducting Backward Inclined Fan Blades Allow Lint to Pass Through the Fan and Not Clog the Ducting or Fan Fully Automatic Fan Control Operates the Booster Fan whenever the Dryer is Operating Duct Size: 4 Watts: 78 HVI CFM/br.2 WG: 150