Get that pesky air moving. Good for getting colder air inside during night.

Uses 150x24mm fan. I used https://www.delta-fan.com/AFB1524HH-AF00.html

Case is nearly snap fit. You can glue it or put tape around the seam if you like to.

Just add air hose after. Air hose inner diamater 150mm. Biltema sells with p/n: 87-3828

Vent also included, if you need to make air come through wall, plywood or something.

Good for campers as well(?).