Door Gap Leakage Calculator

This door gap calculator provides an estimation of the minimum required net air flow supply (cfm) to achieve a given pressurisation level, P (Pascal) based on the formula originated from BS 5588 or MS 1472 below. In the second section, it utilises the same formula for the estimation of maximum allowed door gap (mm) for a given net airflow (cfm)

Variables can be manually calculated using this equation should the gap width of each sides of door leaves be different from one another.