Dunham provided mechanical and electrical engineering for three building additions and one free-standing facility with a pedestrian tunnel connection to the concourse. This two-phase expansion includes jet gates, retail space, concourses, Northwest World Club, elevators and escalators, extensive moving walkways and three rotundas. The project included the addition of four 13800-volt substations and emergency power at 4160 volts, including cabling, ductbanks, transfer switches and switchgear.
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