The Mayo Clinic Jacksonville campus is the #1 Hospital in Florida according to a 2018-2019 US News and World Report. The eight-story Davis Building is the tallest building on the Mayo Clinic Florida campus. It houses many specialty medical and surgical services, as well as the Bundy Café & Atrium, the Mayo Pharmacy, and the Mayo Optical Shop.

The Davis Building had aging air conditioning equipment in need of replacement. This project had a challenge in that all of the components had to be sized such that they could navigate a narrow pathway from a freight elevator through multiple mechanical rooms and down a small hallway.

In addition, each of the Air Handling Units could only be down over the course of one weekend during the replacement. This meant that the project team had from 5PM on Friday afternoons until Sunday evenings to have the old units disassembled and removed and the new units fully assembled, installed, piped and running.

This project required a tremendous amount of coordination so that the units could be sized to meet the required performance, be able to be broken down into small enough component parts to navigate the pathway to their eventual location, fit in their final location, and have modules that could be assembled in advance and staged in the mechanical room.

Redundancy was a major concern on this project. All units were selected so that the FANWALL arrays would provide over 90% airflow redundancy in the event of a fan failure. The variable frequency drives were also provided as Redundant Variable Frequency Drive Packages so that power would automatically change over to the redundant drive in the event of a drive failure.

The team worked together to address all of the challenges and meet the requirements of this unique situation. The replacements happened in a timely manner, with each unit being replaced over the course of one weekend, and the installations were successful.

Equipment Used:

  • Nortek Air Solutions - Temtrol Model ITF Custom Rapid Knockdown Air Handling Units with FANWALL TECHNOLOGY Supply fan arrays with zero net loss backdraft dampers and coplanar silencers, Electrofin coated chilled water coils, Evergreen UV light arrays, internal lighting, factory furnished casing penetrations (so that no holes had to be field cut for controls), injected foam wall and floor insulation and aluminum treadplate flooring.
  • Yaskawa Model Z1000R Redundant Variable Frequency Drive Packages
  • Price Model SDV Single Duct Terminal Units with Hot Water Reheat Coils
  • Loren Cook Model QMX Mixed Flow Inline Return Fan


Location: Mayo Clinic, Jacksonville, Florida Campus

Engineer: Newcomb and Boyd Consulting Engineering Group, Atlanta, GA

Mechanical Contractor: W.W. Gay Mechanical Contractor, Jacksonville, FL

Product: Air Handling Units with FANWALL TECHNOLOGY®, VFDs, Terminal Units, and Mixed Flow Inline Return Fans

Manufacturers: Nortek Air Solutions - Temtrol, Yaskawa, Price, Loren Cook

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