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Filtrete 18-in W x 30-in L x 1-in MERV 5 Basic Pleated Air Filter (3-Pack) in the Air Filters department at Lowes.com
3M Filtrete 18x30x1 Micro Allergen Reduction Air Filter | eBay
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18x30x1 Flanders EZ Flow Filters 10155.011830
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Filtrete 18x30x1 Allergen Defense Air Filter 1000 Mpr : Target
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