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Buy 18x30x1 (17.5 x 29.5) DuPont™ Allergen Air Filter (MERV 11) | AirFilters.com
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HDX 18 in. x 30 in. x 1 in. Standard Pleated Air Filter FPR 5, MERV 8 HDX1P5-011830 - The Home Depot
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Filtrete 18x30x1 Air Filter MPR 1000 MERV 11, Allergen Defense, 6-Pack (exact dimensions 17.81x29.81x0.81) - Amazon.com
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18x30x1 Air Filter Glasfloss GDS Series Disposable - Box of 12
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18x30x1 Air Filters - MERV 8, 10, and 13 | Second Nature™
Filtrete 18x30x1 Air Filter, MPR 1200 MERV 11, Allergen Plus Odor Reduction, 1 Filter - Walmart.com
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