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.
| Flexible Duct | |
|---|---|
| Duct Size(inches) | Design Air Flow |
| 5 | 50 |
| 6 | 75 |
| 7 | 110 |
| 8 | 160 |
| 9 | 225 |
| 10 | 300 |
| 12 | 480 |
| 14 | 700 |
| 16 | 1000 |
| 18 | 1300 |
| 20 | 1700 |
| Round Metal Pipe | |
| Duct Size(inches) | Design Air Flow |
| 5 | 50 |
| 6 | 85 |
| 7 | 125 |
| 8 | 180 |
| 9 | 240 |
| 10 | 325 |
| 12 | 525 |
| 14 | 750 |
| 16 | 1200 |
| 18 | 1500 |
| 20 | 2000 |
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.
