AVT Solar Powered Air VAN / TRUCK / TRAILER 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. 200 mm Diameter, and ONLY 25 mm HIGH - ULTRA LOW PROFILE to fit under any roof rack. Simple to fit - Just cut an 82mm 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. No moving parts, no noise, simple installation. When first exposed to sunlight, the vent will turn on within 20 seconds and start extracting warm air automatically. Suitable for cars, vans, trucks, trailers, dog vans, horseboxes and domestic uses.