Soler & Palau DBF-100XC Dryer Booster Fan The PV-100x offers a fully enclosed motor with Class F insulation which ensures a long, trouble free life Current sensors are Sand Ps "preferred'' method of activation The current sensing device can be installed at the outlet (where the dryer plugs into the wall) or at the circuit breaker box The PV-100x offers a fully enclosed motor with Class F insulation which ensures a long, trouble free life Current sensors are SandPs "preferred'' method of activation The current sensing device can be installed at the outlet (where the dryer plugs into the wall) or at the circuit breaker box