Hi All,

Assuming that one of the hazardous chemical area also has a fresh air supply (in addition to the exhaust), how do we determine if the min exhaust rate (0.5cfm/sq.ft) is achieved.

Are we supposed to compute: Exhaust (cfm) / Area (sq.ft) ?
OR
[Exhaust (cfm)- Supply (cfm)]/ Area (sq.ft)

Thanks for your clarification