1509.4 Cooling Towers

Cooling towers in excess of 250 square feet (23.2 m²) in base area or in excess of 15 feet (4572 mm) high where located on building roofs more than 50 feet (15 240 mm) high shall be of noncombustible construction.

Exceptions:

1. Drip boards and the enclosing construction of wood not less than 1 inch (25 mm) nominal thickness, provided the wood is covered on the exterior of the tower with noncombustible material.
2. Fill and drift eliminators may be of combustible material if the towers are provided with automatic sprinkler protection complying with Section 903 of this code.
3. Fill and drift eliminators that comply with Section 908 of the New York City Mechanical Code.