In July 2010, ANSI/ASHRAE/ASHE released Addendum “d” to Standard 170, which reduces the minimum design humidity for short-term patient care spaces from 30 percent to 20 percent. ASHE has published a number of other documents describing the background and rationale for this forward-thinking evolution to the Standard, but this brief article focuses on the design and operating implications that must be considered when implementing the expanded humidity range.
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