Tonight I remove the plastic film from the fuel tank cover using a hair dryer. I have two different air vent systems from Vans RV. One option was the standard NACA vent and the other was a RV-10 rectangular vent kit. After looking at the operation of both of these I have decided to use the standard NACA vent. I think it will be easier to direct the air flow from both sides of the cabin with this type of vent.