The roof vent fan is designed to provide efficient ventilation for your bathroom or campers vent. This 14x14inch roof vent is suitable for most and trailer roofs measuring 1-1/4 to 2-1/4 inches thick. The trailer roof vent is make of that keeps out both sun and rain. Seamless construction provides weather sealing, leaks and maintaining a tight fit for long lasting . Promotes ventilation by allowing freshly air in and letting hot air escape while keeping your vehicle secure and locked.