Ventilation Flow Calculator

This calculator is designed to estimate the theoretical airflow through ventilation openings and gaps. By entering the opening dimensions, discharge coefficient, and estimated pressure difference, you will receive an indicative estimate of the flow rate.
 

Note
The results are based on the given input values and do not replace actual measurements. To determine the real airflow, the pressure difference must be measured on-site using proper equipment. The purpose of the calculator is to provide an overview and support planning as well as comparison of alternatives.