air changes

air changes

A measure of the volume of air supplied to or exhausted from a building (or room); usually expressed in terms of the number of complete changes of air per hour in the room or space under consideration.
References in periodicals archive ?
Alex Jones ATHE fan should do at least eight air changes an hour so that's a full air change every seven to eight minutes.
Depending on the level of cleanliness (class of the cleanroom), the required airflow rates vary from a few to a few hundred air changes per hour (ach).
West park leisure centre has a health suite and currently the ventilation system is not getting the required air changes under cibse guidance.
Currently, the code permits seven air changes per hour.
Results of Ventilation Measurements Using PFT Technique Schoolroom Measurement Period Air Changes per Hour, [h.
Our blower door test finished in about ten minutes, and the computer printout said eleven air changes per hour.
For reference, the filter manufacturer, Erlab, maintains essentially zero air changes in their laboratory in France, relying solely on the fume hoods to contain contaminants and filter the air in the room.
They not only supplied the building, but went out of their way to find us a cooling equipment supplier and fit a high efficiency strip door that provides convenient access and minimises air changes to keep cooling costs lower.
Depending on the level of cleanliness (class of the cleanroom) the required airflow rates can vary from a few to few hundred air changes per hour (ACH) (ASHRAE 2011, Xu, 2004).
The mobile and stationary versions of the CamCleaner 6000 use HEPA filters to reduce the number of required air changes.