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Rectangular Ducts - Commonly used Dimensions

Metric dimensions of commonly used rectangular air ducts in ventilation systems

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Commonly used rectangular duct sizes in air handling ventilation systems:

Width
(mm)
Height (mm)
10015020025030040050060080010001200
200 1) 1) 2) 3) 3) 3) 3) 3) 3) 3) 3)
250 2) 2) 2) 2) 3) 3) 3) 3) 3) 3) 3)
300 1) 1) 1) 2) 2) 3) 3) 3) 3) 3) 3)
400 1) 1) 1) 2) 1) 2) 3) 3) 3) 3) 3)
500 3) 1) 1) 2) 1) 1) 2) 3) 3) 3) 3)
600 3) 1) 1) 2) 1) 1) 1) 2) 3) 3) 3)
800 3) 3) 1) 2) 1) 1) 1) 1) 2) 3) 3)
1000 3) 3) 3) 2) 1) 1) 1) 1) 1) 2) 3)
1200 3) 3) 3) 3) 1) 1) 1) 1) 1) 1) 2)
1400 3) 3) 3) 3) 3) 2) 2) 2) 2) 2) 2)
1600 3) 3) 3) 3) 3) 1) 1) 1) 1) 1) 1)
1800 3) 3) 3) 3) 3) 3) 2) 2) 2) 2) 2)
2000 3) 3) 3) 3) 3) 3) 3) 3) 1) 1) 1)

1) Preferred, 2) Acceptable, 3) Not common

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