Discussion in 'Roofing and Siding' started by nealtw, Aug 15, 2011.
Has anyone seen a study that shows these move more air than any other vent of the same size
Check out the MFG's websites Lomanco, Inc., Ventilation, Ventilators, Vents, Whirlybirds, Intake Vents, Exhaust Vents, Foundation Vents, Attic ventilation or Air Vent
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
Wind blowing over an open hole will vacume the air, what happens when it is stopped and I would like to know how that would compare on a day when there is no wind because that what really counts.
Your right the wind moving over a hole can pull a vacuum, but the same wind turning the wind vane moves a lot more air. and on a no wind day most roof vents are 6 or 8', mine is 14" and because its a flat roof i put it two foot in the air. This creates more chimney
action and moves more air. also it does not get under the snow and stop working like flat vents. I really like the wind vents
I'm just trying to settle an arguement for a couple of friends, everyone as an opinions and no one has proof. Still looking for that study or text book or something.
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