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I have a squirrel cage fan at the pulling end of the tube that seems to blow a lot of air, and is quiet. I would imagine that if the ID of the PVC is the same at the ridged hose, it will move more air b/c there is less friction. Now I am thinking of doing the same thing for my passive cowl engine vents. Would also make them more durable, as mine pass through a lazzerette, and get a little beat up from throwing stuff in the locker. Would look really koool too.