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Azwar Fuzail , Project Manager MEP , Shamal Electro Mechanical Contracting Company WLL
As a general practice 400 CFM/Ton can be used for typical office applications. 400 cfm/ton thumb rule is based on an average sensible heat ratio of 0.72 which is a nominal value.
It can also calculated from delta enthalpy (Mixed air- supply air) using a psychometric chart.
