The Great Duct Debate: Another View of Equivalent Sizing explains why, if duct is the only thing you are converting, you should use equivalent diameter rather than equivalent area when converting a round duct to flat oval or rectangular. This article was published in the "Tech Tips" section of the November 2001 issue of SNIPS magazine (pages 32, 34, and 36). It appears through the courtesy and permission of SNIPS magazine and Business News Publishing. To view, click " Tech Tips."
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