The Airport is a permanently installed air exchanger that can continuously remove stale air from the interior of your RV and replace it with fresh air from outside. The Airport's unique design helps transfer the temperature of the outgoing interior air to the incoming outside air to help maintain a comfortable temperature in your living space. The kit contains one Airport, 2 exterior vents, clamps, flexible duct and 12 volt switch. Airport can be combined with a solar panel for use in stored RV's.