Feature:1. FLYING OBJECTS BLOCKING: 340x340mm opening size, this vent is mounted on the top of the vehicle, with stainless steel screen to prevent flying object from entering the vehicle.2. ENDURING STRUCTURE: Seamless one piece frame, weather resistant and leakproof. UV resistant semi transparent white cover allows some light to pass through.3. STRONG COMPATIBILITY: Direct replacement for broken vent. Compatible with 1-1/4in to 2-1/4in thick roofs, fits standard 14in x14in opening. 2 wire design for easy installation.4. CLEAN AIR CIRCULATION: Ideal for RVs, trailers, buses, yachts, and other large vehicles. Quickly exchange indoor and outdoor air to keep your cabin clean and comfortable.5. ADJUSTABLE SUPPORT: Equipped with adjustable support rod, you can adjust the support rod 0 to 45 by knob. Enhances the ventilation, so that you have clean air.Specification:Item Type: RV Roof VentMaterial: UV resistant PolyethyleneInstallation Opening Size: Approx. 340x340mm / 14x14inDimensions: Approx. 420x420x135mm / 16.53x16.53x5.31inFeatures: Equipped with stainless steel screen and support rods, support rods adjustable from 0-45via knobApplication: Suitable for installation on large vehicles such as RVs, trailers, camping vehicle, motorhomes, buses, yachts, etc., quickly exchange indoor and outdoor air for clean air inside your cabin.Package List:1 x RV Roof Vent 1 x Support Rod Knob