AVT Solar Powered Air VAN ROOF VENT Warm Air Extractor. Our new ultra low profile aerodynamic extraction unit is ultra quiet, will work in low light, and extract 5cu.M per minute. Featuring a large efficient solar panel that does not need intense direct sunlight to operate. 200mm Diameter, and ONLY 25mm HIGH - ULTRA LOW PROFILE to fit under any roof rack. Simple to fit - Just cut an 82mm and above hole(this is a common hole saw size, though you can go larger), place the supplied waterproof rubber gasket over the hole, place the vent body into the hole and then tighten inside the vehicle by hand with the large plastic nut. Its that easy. No nuts, bolts, or drilling required.