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# Rectangular Ducts - Dimensions

Commonly used rectangular duct sizes in air handling ventilation systems:

Rectangular Ducts - Dimensions
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

## Related Topics

### • Ventilation Systems

Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

## Related Documents

### Duct Sizing - the Equal Friction Method

The equal friction method for sizing air ducts is easy and straightforward to use.

### Ducts - Cross-Sectional Area vs. Diameter

Circular ducts sross-sectional areas.

### Ducts or Pipes through Steel Joists - Maximum Sizes

Maximum sizes of ducts or pipes through K series joists.

### Equivalent Diameter - Rectangular vs. Circular HVAC Ducts

Rectangular equivalent diameter for air flows between 100 - 50000 cfm.

### Fluid Flow - Equivalent Diameter

Convert rectangular and oval duct geometry to a equivalent circular diameter - online calculator with imperial and SI-units.

### Rectangular Air Ducts - Velocity Diagram

Velocity diagram for rectangular air ducts - metric units.

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