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When you reduce the height of the duct you must go significantly wider, otherwise you kill airflow.
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...have to maintain the same velocity and friction rate. there are online calculators for that.
Has to do with the surface of the duct relative to area as well - more surface vs area causes greater friction rate, so you need a wider duct to get by.
Has to do with the surface of the duct relative to area as well - more surface vs area causes greater friction rate, so you need a wider duct to get by.
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