Last October, Didcot power station in England suffered from a debilitating fire that took down their cooling towers. The fire impacted the nighttime operation of the power plant, but luckily electrical demand was low and no one was hurt. Fires such as this one and another that recently took place on top of a new skyscraper in Panama are great supporting evidence of why New York City codes demand non-combustible cooling tower construction. In fact, New York City's mechanical code requires that all components be constructed of non-combustible materials. This includes fans, internal distribution piping and, of course, the casing. Exceptions are given to tower infill and drift eliminators, but only in certain circumstances when it is deemed safe and appropriate. Read more at the source link below.