The S&P duct calculator allows three different calculations to be carried out quickly and with ease. These calculations are divided in four areas:1. Diameter converter, which allows converting circular to equivalent rectangular ducts.2. Calculator of different ventilation parameters, with which will be able to obtain the diameter, the air speed, the airflow and the dynamic pressure of your installation.3. Pressure drop calculation tool for installations with straight sections and duct system elements.4. Units converter, with which you will be able to transform speed, airflow, power and pressure units for other equivalents in different scales.