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where Qa = Required flow capacity in SCFM of air. 70.5 = Factor converting pounds of vapour to cubic feet of air Q = Total heat input in BTU h-1. L = Latent heat of vaporisation for hexane in BTU lb-1 = 144 kJ kg-1. M = Molecular weight for hexane = 86.17. The factor 70.5 is given in API 2000 and is based on the vapour density of hexane at 15.5°C. ................
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