Online Duct Sizing Tool

CalcuDUCT is a free, web-based duct sizing tool designed for HVAC professionals and engineers. It offers a straightforward interface for calculating duct dimensions, velocities, and pressure drops for both rectangular and circular ducts. Users can select between SI (metric) and US (imperial) units, making it versatile for international applications.

🔍 Key Features of CalcuDUCT

• Duct Shape Selection: Choose between rectangular and circular duct configurations.

• Unit Flexibility: Switch between SI (litres/second, mm) and US (CFM, inches) units to suit project requirements.

• Material Options: Select the duct material from a drop-down list, with galvanised steel as the default.

• Input Parameters: Enter airflow rates and duct dimensions to calculate velocity and pressure drop per unit length.

• Aspect Ratio Consideration: For rectangular ducts, maintain an aspect ratio up to 5:1 to ensure valid results

• Design Assistance: Provides quick estimations to aid in the preliminary design phase.

⚠️ Important Considerations

• Accuracy Disclaimer: CalcuDUCT is intended for design assistance only. Users should verify results against other reliable methods.

• Flex Duct Limitations: The tool does not account for flexible ducts due to their variable resistance characteristics.

• Verification: Always cross-check calculations with industry standards or consult with a professional engineer for critical applications.