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.
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The system is based on a three-module concept configurable depending on requirements; the UltraGas condensing gas boiler feeding TopVent units for recirculation or RoofVent units if air changes are required.
The term or metric that is most often used as an indicator of the internal ventilation effectiveness for laboratory design is the air change rate--or more specifically, the number of air changes per hour (ACH).
The ratio of moisture to air changes with various factors such as temperature and pressure indicates its saturation.
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).
Currently, the code permits seven air changes per hour.
Results of Ventilation Measurements Using PFT Technique Schoolroom Measurement Period Air Changes per Hour, [h.sup.-1] Room 58, Feb.
Our blower door test finished in about ten minutes, and the computer printout said eleven air changes per hour.
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. The air circulation generated by the CamCleaner creates a uniform temperature distribution throughout the premises, even in rooms with high ceilings.