Originally Posted by nealtw
I have checked it out, they don't make any claims like you would expect, if they really do better than flat vents.
I have one 14"rd. wind vent in a attic that is 800 Sq.' At a 7 mi. an hr. wind, it will move 4 times more than the 12" sq vent that was there before. This was
tested with a CFM tester that i use for balancing commercial kitchen in restaurants. Paul