Circular Duct Sizes

Dimensions of circular ventilation air ducts

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Common circular duct sizes used in air handling ventilation systems:

Nominal Diameter (mm)	Outside Diameter (mm)	Inside Diameter (mm)
63	63 - 63.5	61.8 - 62.3
80	80 - 80.5	78.8 - 79.3
100	100 - 100.5	98.8 - 99.3
125	125 - 125.5	123.8 - 124.3
160	160 - 160.6	158.7 - 159.3
200	200 - 200.7	198.6 - 199.3
250	250 - 250.8	248.5 - 249.3
315	315 - 315.9	313.4 - 314.3
400	400 - 401.0	398.3 - 399.3
500	500 - 501.1	498.2 - 499.3
630	630 - 631.2	628.1 - 629.3
800	800 - 801.6	798.0 - 799.3
1000	1000 - 1002.0	997.9 - 999.3
1250	1250 - 1252.5	1247.8 - 1249.3

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Related Topics

Ventilation Systems Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more

Related Documents

Velocities in Ventilation Ducts Recommended velocities in ventilation ducts
Air Ducts Friction Loss Diagram Major loss diagram air ducts - SI units
Air Ducts Velocity Diagram Diagram with air flow volume, duct size, velocity and dynamic pressure
Rectangular Air Ducts Velocity Diagram Velocity diagram rectangular air ducts
Duct Velocity Calculate velocities in circular and rectangular ducts - imperial and SI-units - online calculator
Equal Friction Method The equal friction method of sizing ducts is easy and straightforward to use

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