Temperature, ventilation and condensation are some of the issues that complicates RV living. But keeping the vehicle cool and free from humidity and condensation may be addressed by installing a floor vent.
A floor vent in combination with a standard roof vent, should produce enough natural convection, that the airflow could sustain itself. By placing one vent at the bottom and the other at the opposite end in the roof of the vehicle, some of the conditions are created for a sustained convection airflow. A basic example is when warm air rises. For convection to happen, distance between the vents, a height difference and a temperature difference all play a role.
As the warm air exits the roof, cooler air will be pulled in from underneath the vehicle, enhancing the air flow. The cool air will lower the temperature and the airflow against the skin will make you feel more comfortable.
A separate ‘cooling duct’ could also be directed from the floor vent towards the fridge. Cooling the fridge’s coils will lower the operating hours and extend your boondocking stay substantially.
In my Ford Transit, I chose the wall cavity behind the driver’s seat to cut a hole through the floor and connect it to an existing entry point under the vehicle. With some basic materials, I created a floor vent with a four inch diameter.
You can read all about it, view detailed photos and video on the Mod5: Floor Vent project page. A free guide can also be downloaded as a PDF-file.