I'm considering adding a roof fan to my pop-top. I'm looking at the MaxxAir fans. They have the regular big square fan (900CFM) and a smaller "dome" fan at 200CFM. This got me thinking about the CFM actually required in a Ford van. According to a quick search the interior space in a Ford van is about 250CF. Say minus all the cabinetry and plus the pop top that's 300CF of space.
Does that really mean that the large fan can move 3 times the air inside, in one minute
!? That seems insane.
Can someone explain this please? haha