The BOK Center, or Bank of Oklahoma Center, is a 19,199 seat sports and entertainment arena in Tulsa, Oklahoma. The BOK Center was the flagship project of the Tulsa County Vision 2025 initiative for regional economic development and long-term capital improvements. The city of Tulsa asked architect Cesar Pelli to design an architectural icon. The resulting 565,000 square foot building contains 350,000 square feet of exterior metal panels, 75,000 square feet of glass, 30,000 cubic yards of concrete and 4,000 tons of structural steel. The first event held in the new BOK center was a sold out performance given by The Eagles on September, 6 2008. The Bank of Oklahoma Center has hosted concerts by many big name performers including Billy Joel and Elton John, Bruce Springsteen, ACDC, Paul McCartney, Carrie Underwood, and The Jonas Brothers. It is also the home of the Tulsa Shock of the Women’s National Basketball Association, the Tulsa Oilers of the Central Hockey League, and the Tulsa Talons of The Arena Football League. The range of events and the scale of the building required an HVAC system that was both large enough to heat, cool, and ventilate the large arena and quiet enough to not interfere with the acoustics during concerts and events while also being energy efficient. AAON supplied the BOK center with four 90,000 cfm rooftop air handling units and one 60,000 cfm rooftop air handling unit containing chilled and hot water coils. These rooftop units were delivered in multiple sections to be ﬁeld assembled for easier job site maneuverability. AAON also supplied twelve modular indoor air handling units, adding an additional 85,175 cfm of airﬂow to the building.