Dive Trailer – Roof Ventilation Fan Installation

The Model 6000RBTA 3-speed reversible roof ventilation fan with automatic thermostat controlled opening from Fantastic Vents is an easy swap out for any standard 14″ roof vent in any trailer, truck, or R.V., that is IF your vehicle already has a standard 14″ roof vent installed in it.

But what if it doesn’t already have one? Today I will be walking you through installing this roof ventilation fan on my dive trailer which did not come from the factory with any roof ventilation at all on it at all.

  1. Cutting a hole for the roof vent

    Cutting a hole for the roof vent

    First I had to decide exactly where I wanted to install the roof vent, making sure that it would not interfere with the trailer frame cross bars, and that I had a 12 volt power source accessible near it.

  2. Once I had decided on its location I measured and marked a 14 inch square area on the roof of the trailer with a permanent marker and drilled a hole in each corner.
  3. I then used a small circular saw fitted with a metal cutting blade to carefully cut along the line that I had marked creating a 14″ square opening in the center of the roof. I could have used a jigsaw to cut this opening, but the circular saw cuts straight lines easier and it was handy.
  4. Dropping roof vent into place

    Dropping roof vent into place

    Once I had the opening cut out I placed the supplied foam gasket around the opening and dropped the new vent into place making sure that the foam gasket was straight all the way around the vent.

  5. Before you mount the vent frame to the roof, run the 12 volt positive and ground wires to the fan and connect them using the supplied bullet connectors. The white wire is the ground wire and the black wire is the hot wire. Turn on the fan and check airflow direction to make sure you have not crossed the wires. If the fan direction is not correct simply reverse the wires.
  6. The installation kit comes with 16 stainless steel sheet metal screws to secure the vent frame down onto the roof through the pre-drilled mounting holes all the way around the vent frame.
  7. Turn the hand crank on the inside of the vent to open the vent cover. You will then be able to better access the screw holes on three sides of the vent. By then closing the cover by turning the hand crank in the opposite direction you will be able to access the screw holes on the back side of the frame where the lid is hinged.
  8. After all of the mounting screws are securely in place you can now seal the vent against leaks. This is normally done by applying a bead of silicone around the base of the frame where it meats the roof all the way around, and another drop of silicone on each screw head.
  9. Alternatively you can use a product called RoofSeal from EternaBond which is a micro sealant in a convenient tape form that you roll out across a joint where you want to create a watertight seal. I have used this product previously on both my food trucks and house roof and am very impressed with its ease of use, convenience, and durability. It comes in several different colors to match the roofing material color and several sizes to meet your needs. Since I already had a roll of 2″ wide white RoofSeal tape left over from my last food truck, I will be using that on the trailer to create a permanent watertight seal between the roof and the vent frame.
  10. Once the vent frame has been sealed to the roof, the next step is to install the garnish ring around the vent frame on the inside. This will more than likely have to be sized for your particular installation because it comes extra long and unless your roof is 6″ thick it will not fit as is.
  11. To resize the garnish ring depth simply measure how deep you need the ring to be, score the side of it with a razor knife and cut the corners down to your score line. Then snap off the excess from each side.
  12. Once the garnish ring has been resized to your roof thickness simply slide it into position and secure it with the supplied mounting screws.
  13. Snap on the supplied bug screen and your installation is complete.
  14. Simply set the maximum temperature to where you want it to be and when the thermostat reaches that temperature the vent cover will automatically open and turn the fan on dropping the air temperature inside. When the air temperature inside drops below your selected temperature the fan will automatically turn itself back off. The lid will remain open until you push the button or turn the hand crank to close it or until the rain sensor becomes wet. Once the sensor dries the lid will re-open automatically to provide ventilation.

Next I will walk you through installing a MaxxAir Fan/Mate rain cover to the Fantastic Vents ventilation fan that we just installed.

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