Product review (5 stars): WOW What a Difference!!!
I installed this the day I received it. The install on my particular house was difficult due to it not being a flat surface where it needed to go ( I had to do some rigging ) After it was installed I waited a couple hours then went into my laundry room IT WAS THE SAME TEMP AS THE REST OF THE HOUSE!!!!!!!!!!!!!!!!! The laundry room had been 10-12 degrees colder than everywhere else! This vent cover is awesome!