Product review (3 stars): The founder was a fairly easy install but when it came to currents sensor switch ...
I recently purchased a 4 inch metal and line fan plus current switch. The founder was a fairly easy install but when it came to currents sensor switch I called technical support of the manufacturer and no matter which way I hooked it up on my dryer I could not get it to work so I left me no other choice but to hardwired switch controlling. I would recommend the average  homeowner. I am electrician and adding a switch control was not a problem for me. The fan works very well and dry so close a lot faster