908.1 General
A cooling tower used with an air-conditioning appliance is installed in accordance with the manufacturer’s instructions. Factory-built cooling towers must be listed to UL 1995 or UL/CSA 60335-2-40.
908.2 Access
Cooling towers, evaporative condensers and fluid coolers require ready access. Resolve the access path in design, not in the field around piping, structure and adjacent equipment.
908.3 Location
The equipment must be located so vapor plumes do not enter occupied spaces. Plume discharge must be at least 5 ft above, or 20 ft away from, any building ventilation inlet. Location on the property must also comply with the International Building Code.
This is the check that most often moves a tower late: it can fit structurally and still sit next to an outside-air intake.
908.4 Support and anchorage
Supports are designed in accordance with the IBC, and seismic restraints comply with the IBC where required. On South Florida roofs the governing load case for equipment is usually wind, so give the structural engineer the operating weight and footprint early.
Why it matters
One tower location touches several disciplines at once: mechanical (equipment, airflow, plume), architectural (access and building openings), structural (supports and anchorage), electrical (service and disconnect access) and plumbing (makeup water and drainage, covered in part 2). A late relocation reopens all of them.
Where to show it
As applicable: roof or equipment plan with every outside-air intake dimensioned to the tower discharge; mechanical schedule with the listing; equipment sections; structural support details; and the manufacturer’s installation requirements.
Do
Identify the exact tower and its listing.
Show the service access route early.
Dimension the plume-to-intake relationship on the plan.
Coordinate supports and anchorage with structural.
Review adjacent equipment before fixing the location.
Do not
Place the tower by available roof area alone.
Ignore nearby outside-air intakes, including the neighbor’s and future ones.
Assume manufacturer service clearances and code separations are the same thing.
Leave support design for construction.
Field tip
Review the cooling tower and every outside-air intake on the same coordination plan. A dimensioned plume-to-intake check during design costs far less than moving equipment after supports, piping and feeders are coordinated. Intake rules elsewhere in the code: outdoor-air intake separation. Next: #175 — IMC 908.5–908.7 Cooling Tower Water & Drainage (2/3).
Code basis
2024 IMC 908.1–908.4 model-code education from the owner-provided Daily Code Talk. Confirm the adopted edition (in Florida, the Florida Building Code, Mechanical), local amendments, the listing and the manufacturer’s instructions. Not a structural or wind-load design.