when taking a duct traverse i know its ten X upstream or 5 X downstream, but what do you multiply to get five times. the short side of the duct, or the square feet of the smaller duct.
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when taking a duct traverse i know its ten X upstream or 5 X downstream, but what do you multiply to get five times. the short side of the duct, or the square feet of the smaller duct.
Diameter
What about square duct
you are trying to make sure you don't get turbulents. I don't remember what it is for rectangular but take the area, convert to round and you'll be real close.
take the diagonal