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Michigan Filter Manufacturing is proud to introduce the Air Defense HD (High Dust) Mechanical Merv 8A Pleated Filter. Using the latest technology and R&D, the Air Defense HD line of filters provide a high dust holding capacity and are now available to the public. The Air Defense HD Mechanical MERV 8A provides a high dust capacity unlike anything else being the first of its kind on the market. We believe that you should be able to live, love, and embrace life with clean and safe air.