Product review (5 stars): Fantastic, Works fantastic.
My dryer is in our bathroom and we always had problems keeping the cold air from coming back through our dryer vent, this product is fantastic, it actually worked.  I was amazed at how simple it is and why I had not looked into something like this before.  I have checked it several times being concerned about lint buildup and getting hung up but no problem.  Why this product is not more available is beyond me.  The other pieces of junk the home improvement stores sell should be banned.  In a era of saving valuable energy this is a must have.