If your vintage trailer or motor home has a Fan-Tastic Vent in the roof, you want this vent cover! It will protect your fan from sun, wind, rain, and bugs! You won't need to worry about closing the vent when it starts to rain and you can keep the vent open when driving down the road without fear of damaging the lid or lifters. This cover extends the life of the fan and lessens the chances of leaking around it as well. Fits over most 14" x 14" roof vents and high-powered ventilators!