differences between individual products. Some manufacturers use simple filter media made from paper, while other products contain elaborate filter elements. Combi-filters [...] handling of the filter elements. The filter media are then bonded into frames made from wood, metal or plastic, which makes them easier to install or replace in [...] pleating ? Pleating describes the process in which the filter media, usually made from fleece or paper, is folded into an accordion-like shape. The purpose of
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