1、12V Reversible Fan: This ceiling vent has a 12V reversible fan that exhausts dirty air and draws fresh air into your RV, camper or enclosed trailer. 2、One Piece Frame: This ceiling vent features a one piece frame that prevents rainwater from leaking into the RV, and is weatherproof. 3、Replaceable: This roof vent replaces for Ventline, for Jensen and for Elixir vents or is compatible with 1 1/4inch to 2 1/4inch thick roofs and fits standard 14inch x 14inch openings. 4、2 Wire Design: This ceiling vent uses a 2 wire design for easy installation and comes with a white interior piece (or trim piece) and screws for installation. 5、Wide Application: This ceiling vent is perfect for RVs, campers, travel trailers, caravans and motorhomes. Some recreational vehicles may not have roof vents installed, and all weather use is important, especially in summer or rainy weather, to keep rain out and allow fresh air to circulate through your RV.