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the (width to the depth) is4:1
Width to depth is the aspect ration. Try to keep it as low as possible otherwise the friction and noise will be more.
Height to Width ratio of the Duct is known as the aspect ratio of the duct
Aspect Ratio is the ratio of the dimensions of the two adjacent sides of a rectangular duct. High aspect ratios mean high friction, excess energy consumption, more sheet metal and expensive system. Generally aspect ratio used is4:1.
aspect ratio for duct is in ratio1:4
The Ratio of Duct used
L/D where by L is a length of duct
D is the depth of duct
