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Dog box fan, Suck or Blow?

11K views 14 replies 5 participants last post by  dukdawgn  
I went to the Walmart here and bought me one of them clamp on vans(12v) and clamp it to the side of my truck. What kind of fan "sucks" air the best? Some more than others but what kind of CFMs are we talking about? I didnt think about pulling the air out, makes sense.