Mallinckrodt Elementary

NDBS designed and managed the retrofit of an HVAC system for St. Louis Public School District that was nearly 75 years old. The 34,000-square-foot renovation included the removal and replacement of a custom-made, multi-zone air handling unit that had served the building since 1938. It had no cooling capabilities and heated the building using steam radiation. Working with a local MBE mechanical contractor, NDBS installed two new custom air handling units providing 50% redundancy, a central air-cooled chiller plant to supply conditioned air to the building, a hot-water boiler system with heating loop connected to single-duct VAV boxes, and a new temperature controls system to automate operation. The demolition and retrofit was completed in 10 weeks during the summer break and was fully functional for the first day of school.