(1) The filter and water evaporation medium of every air washer and evaporative cooling section enclosed within a building shall be made of noncombustible material.
(2) Sumps for air washer and evaporative cooling sections shall be constructed and installed so that they can be flushed and drained.
(3) Evaporative air coolers, misters, atomizers, air washers and humidifiers shall be designed in accordance with Sections 8 and 9 of ASHRAE Guideline 12, “Minimizing the Risk of Legionellosis Associated with Building Water Systems”.
(4) Evaporative cooling sections shall comply with the requirements of NFPA 214, “Water-Cooling Towers”.