Rectangular Duct Sizes

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Dimensions of common rectangular air ducts used in ventilation systems

Common rectangular duct sizes used in air handling ventilation systems:

Width (mm)	Height (mm)
Width (mm)	100	150	200	250	300	400	500	600	800	1000	1200
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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