Not a 6 inch duct. My exhaust duct was 5 and 3/4 OD. This is 5 3/4 OD. Had to retrofit my duct to get this to work. And I had to build a 1.5 inch box around the finish to house the extended louvers, because the duct was not 6inch and would not go over my duct. Make a six inch duct , six inches.
Rating: [4 of 5 Stars!]