Air changes with the use of exhaust air ventilation. Luftvaxling vid franluftsventilation.

A large number of multifamily buildings have mechanical exhaust air ventilation. The control of such systems' function is often inadequate and adjustment is rarely carried out. One reason for this is the lack of simple methods for determining system performance and air change rates. The report describes a simple method and simple equipment for determining performance in terms of an installation's capacity curve or 'fan installation' curve. Defines terminology and measurement principle. Illustrates equipment and arrangement for measurements.