Frank -
Quote:
Originally Posted by Frank Lee
Perforated screens are velocity sensitive; at low speeds they let in about what you'd expect- say, a 30% open screen will let in 30% of what an unobstructed vent would- and at higher speeds they "close up" to the oncoming flow and appear to the air to be more "solid".
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At what speeds do you think the holes will "close up"?
CarloSW2