This project included replacing two (2) air handlers that serve critical areas such as the Clinical Labs and Operating Rooms. The air handlers were replaced with two (2), 40,000 CFM Custom Air Handling Units. Equipment was selected, and the system designed, to provide the required redundancy if a fan fails. The air handlers were positioned on a structural platform above the roof with walkways in-between both air handlers to allow for convenient and safe access for equipment maintenance.