The volume of air requirement
The volume of air per diffuser or lattice is what is needed for cooling, heating, ventilation or requirements of the area served by the unit. The amount of airflow required when related to quit, sound, or pressuredesign restrictions, determines the proper diffuser grille or size.
In General, volumes of air to the internal areas of the building premises range from 1 to 3 cfm/m2 floor area. Outdoor areas will require increasing volumes of air from 2.5 to 4 cfm/m2 floor area. In some cases, only for heating or cooling load of exterior wall panels or glass surface attributable to the distribution center. Then, the volume of air per linear meter diffuser grille or will vary from 20 to 200 minutes, depending on the heat-transfer coefficient, the height of the wall, and infiltration rate...
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