For best performance install the LB2 Booster Fan as directed below. LB2 Minimum Distance from Dryer in Equivalent Feet* Total Duct Length Equivalent Feet* No Secondary Lint Trap With Secondary Lint Trap 4’ from Dryer** 30 60 90 120 150 15 30 35 40 45 8 8 15 20 25 Designed to provide years of reliable performance. On-board multi-functional control PSC permanently lubricated ball bearing motor is not exposed to heat, lint or moisture. Uses less power than a 50 watt light bulb.