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Executive summary In 2015, the National Air Filtration Association (NAFA) Foundation funded a research proposal by Associate Professor Michael Waring at Drexel University, which was to determine whether high-efficiency filters

One of the busiest airports in the world, Salt Lake City is Delta Air Lines’ third largest hub, with more than 150 scheduled daily departures. Typical of any airport, are

Officials at Keefe Technical School upgraded filter efficiency and found out the improvement keeps the ductwork clean while operating the heating and cooling coils at peak energy efficiency. Statistics from