What do you do when you realize that a vacuum cleaner does not work because the filter is completely clogged? It’s probably not a happy face. After all, the result is a vacuum cleaner that is overheating, having very low performance and electrical efficiency, increasing noise and so on. Now, imagine multiplying those unwanted outcomes by 100, which is the average number of fans in a medium-sized industrial site. It then becomes clear why the periodic hanging of filters, especially in a large facility, is a large maintenance undertaking. When filter replacement is done properly and everything is working as it should, the outside air will be well filtered and the cooling system will be able to do its job. Consequently, the electrical and electronic equipment inside a building or enclosure will be at the right temperature, typically less than 30º C. On the other hand, what is the effect of not replacing filters on time? Eventually a completely dirty and clogged filter and a spi...