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The ELECTRA SILVER 9400 is designed to provide high dust arrestance and low air resistance for your furnace or central air conditioning system. Two layers of woven monofilament polypropylene with integral anti-microbial material provide 10 times more filtration than a disposable fiberglass filter. The deep loading center layer of non-woven polyester allows the Electra Silver 9400 to prolong the time between washings.
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