How often should the filter element of a new fan be replaced?

Generally speaking, the replacement time of filter element is related to the installation location and environment and the configuration of filter screen. Most manufacturers' machines do not have 304 stainless steel screens. Under normal circumstances, in the case of frequent primary cleaning, the intermediate filter element should be replaced once every 2-3 months, and the high-efficiency filter element should be replaced once every 3-6 months.