The “ASHRAE HVAC Duct Sizer” application designed by Carmel Software Corporation for ASHRAE, allows the user to quickly size one HVAC duct run or a range of duct sizes using the constant friction method.

In the “Size by Airflow” mode, the user can specify the total airflow in CFM (or L/s), the aspect ratio and one of either the velocity of air or the friction loss per 100 feet (30 meters). The results include both the exact and rounded height and width (or diameter) dimensions and the calculated velocity and friction loss.

In the “Size by Dimensions” mode, the user can analyse an existing duct system. There are options to input the existing duct dimensions and one of either the airflow or velocity values to derive the calculated duct friction loss.

In the “Range of Duct Sizes” mode, the user can specify minimum and maximum friction loss and airflow values to display a range of duct sizes that fall in between the friction loss bounds.

Additional parameters can be specified such as the duct shape (rectangular, round, or oval), the air temperature and the air pressure.

For further information please click here.