Actual cubic feet per hour

The actual volumetric flowrate of the contaminated gas stream, q, in acfli (actual cubic feet per hour), is obtained using Charles law. 

The hole size of the diffuser is designed such that the oxygen velocity through each of the holes (at the maximum oxygen operating flow rate through the diffuser) is typically 200 ft/s (60 m/s). Note that the flow rate, Q, must be in actual cubic feet per hour (acfh). 

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