Room pressure for critical environments

The quantitative determination of differential pressure and airflow for proper room pressurization is an HVAC design area that has not yet developed a standard rule.In this article current design guidelines and field practices for room pressurization are investigated. Practical field tests were performed in two types of facilities: a tuberculosis research lab and a cell transplant unit. In addition to the quantitative test results, the author provides a methodology for practitioners for verifying airflow direction, into or out of the room.Tests were performed too on door swings and anterooms Finally the author gives values that may be a useful reference in designing rooms that require a proper negative or positive pressure.