Product review (4 stars): IT WAS FAIRLY EASY TO INSTALL
THE UNIT WAS DELIVERED WITHOUT PROBLEM. IT WAS FAIRLY EASY TO INSTALL. THE FAN WHEN ACCELERATING SPEED AND WHEN DECLERATING HIT THE HOUSING AND KNOCKED.SINCE IT WAS INSTALLED AND RUNNING FINE OTHERWISE WE DECIDED TO SEE IF IT WOULD STOP KNOCKING AFTER A LITTLE USE. IT HAS AND OPERATES GREAT WE ARE COMPLETELY SATISFIED.