1/2 inch
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39in.
4 inch 5d bend 45degree elbow center how much
To calculate the square meters of a duct you must add the total length of the straight duct work plus the loss of length from the elbows. A standard elbows measurement is 15 feet for each elbow with a 4 inch diameter or 20 feet for an elbow with a 6 inch diameter.
6 inches
6 nches