John McKissack, P.E., has been a product manager for the last 12 years at Nortek Global HVAC in St. Louis, Missouri. His area of expertise includes configurable DOAS/ high efficiency DOAS systems, and he has been instrumental in the evolution of the Reznor & Mammoth brand of make-up air units. He can be reached at john.mckissack@nortek.com. For more information about Nortek Global HVAC, visit nortekhvac.com.
