Bring in fresh air from the outside with your caravan roof vent. Keep moisture out of your caravan. Run the fan while you are driving and arrive with a well-aired caravan. All seals are made to tight tolerances for your caravan roof cover. Crank the hatch shut to keep rain out. Open it when it is dry. The flyscreen always keeps bugs out. Use in all weather and seasons. Install your new caravan roof hatch by yourself. Measure and cut a hole in the ceiling. Assemble the parts in the hole. Seal it with silicon. Attach the power and you are good to go. Run your caravan roof fan during the night. Whisper quiet. Draw in cooling air as you sleep. No more stuffy nights in your caravan. How did you manage to survive before you added an exhaust fan? If you have the space on your caravan roof you should be able to fit your caravan roof vent with fan. Your hatch fits roofs of varied thicknesses. Install it yourself or pay a professional to do it.