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17.5" x 21.5" x 1" MERV 13 Air Filters - $22.82/ea.
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Aerostar 13 x 21 1/2 x 1 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 6 Pack - Walmart.com
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Aerostar 13 x 21 1/2 x 1 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 6 Pack - Walmart.com
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