Now in the App Store!

The Duct Sizer App has been designed to work in a manner similar to the traditional duct sizing wheels that have been around for many years and that many engineers are accustomed to. Designed to allow quick determination of the duct size(s) that will meet the design goal, to make the HVAC designer’s work easier.

Slide the various scales up and down to determine the desired duct size.

Sizing

Based on Pressure Drop:

• Slide the scales to align the desired airflow with the desired pressure drop per length.
• The required round duct size is the size at the red indicator pointer.
• The equivalent rectangular duct sizes are indicated by widths and heights that are aligned on the scales.
• Verify the velocity by observing the value aligned with the airflow.

Based on Velocity:

• Slide the scales until the desired velocity is aligned with the desired airflow.
• The required round duct size is the size at the red indicator pointer.
• The equivalent rectangular duct sizes are indicated by widths and heights that are aligned on the scales.
• Verify the pressure drop per length by observing the value aligned with the airflow.