Marchald fire retardant air filter

From Italy comes the first advancement in foam air-filter elements in decades. Marchald filters are made of top quality polyester that resists deterioration from gasoline, with two layer construction using dense foam on the inside and a more open-cell foam on the outside. The entire outer surface is ribbed to increase available filtration area while maintaining the filter's original overall size, and the inner mounting ring has a deep channel that prevents the element from slipping off its frame and allowing unfiltered air into the engine.

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