The DBF 110 Dryer Booster inline fan addresses every obstacle | A silent partner for your dryer | The fan compensates for system duct losses and allows the dryer to exhaust warm moist air as the manufacturer intended | The fans can handle up to 60 feet of duct and six elbows | The backward blades allow lint to pass through the fan | The patented control automatically operates the booster fan whenever the dryer is running