Round Duct Sizes Chart

Ducts are used in air handling ventilation systems. It is a conduit used in providing the air. It is used in heating, ventilation, and air conditioning to deliver smooth air. Round duct is created using continuous spiral forming machine and their common sizes ranges would be between 4' to 24' and 6'-12'. It can be mended to any near diameters by using right forming die. Below is the Round Duct Sizes Chart with equivalent diameter of round ducts and the corresponding amount of air flow.

Equivalent Diameter of Round Ducts

Flexible Duct
Duct Size(inches)Design Air Flow
550
675
7110
8160
9225
10300
12480
14700
161000
181300
201700
Round Metal Pipe
Duct Size(inches)Design Air Flow
550
685
7125
8180
9240
10325
12525
14750
161200
181500
202000

Round duct sizes chart helps you to find the size of duct with its corresponding design air flow. Here, equivalent diameter of round ducts are given from 5 to 20. For 5 duct size, the air flow will be about 50.

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