As someone who regularly has to deal with buildings "at-altitude," I am very happy with this added documentation/flexibility, and wanted to convey that. I also appreciate (and personally agree with) the nuance expressed for handling exhaust airflow inputs for facilities 'at-altitude.'

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I might however caution that the interpretation to lock all exhaust airflow requirements to being volumetric in nature and not a requirement of "air mass movement" *could be* problematic in select scenarios involving the monitoring and control of specific particulates/gasses (i.e. DCV, lab air sampling...), again for projects "at-altitude." I'm not anyone's AHJ of course, but if you're ever designing a laboratory/hospital on a mountain, I am suggesting to give this due consideration.

~Nick

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Nick Caton, P.E., BEMP
Senior Energy Engineer
Regional Energy Engineering Manager
Energy and Sustainability Services
Energy Performance Contracting
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913 . 564 . 6361
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nicholas.caton at se.com
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United States
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