The Dometic Quick Cool Ducted Air Grille is a return air grille ceiling assembly for Dometic Air Conditioners with ducted systems pre-installed in the RV. A 14.25" x 14.25" square opening is required for installing this ceiling assembly. A minimum of 2" and a maximum of 5.5" distance between roof and ceiling of the RV is required for installation. Compatible with Dometic Brisk II, Brisk II Evolution, Blizzard NXT, and Penguin II A/C models. 14.25"" x 14.25"" square opening is required for installation 2"" - 5.5"" between roof & ceiling of the RV is required for installation Compatible with Brisk II, Brisk II Evolution, Blizzard NXT, & Penguin II A/C models | Dometic Quick Cool Ducted Return Air Grille, Polar White