John Varley, P.E., FASHRAE is the mechanical discipline manager for AAA Engineering in Chicago and has been a professional in the building sciences industry for more than 35 years. He is a past chair of ASHRAE Technical Committee 9.10 Laboratory Systems and TC 9.11 Clean Spaces and received the Distinguished Service Award from ASHRAE. He has been published in the ASHRAE Journal, ASHRAE Transactions, The International Journal of HVAC&R Research, and Engineered Systems. He holds a bachelor’s degree in mechanical engineering from the University of Akron and a master’s degree in chemical engineering from Cleveland State University.