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16-3/8 x 21-1/2 x 1 Electrostatic Washable Permanent A/C Furnace Air Filter 16-3/8x21-1/2x1 - Amazon.com
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16-3/8 x 21-1/2 x 1 MERV 11 ( MPR 1000, FPR 7-8 ) Pleated 1" Air Filters for AC and Furnace. Case of 12. Exact Size: 16-3/8 x 21-1/2 x 3/4 - Walmart.com
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Aerostar 16 3/8x21 1/2x1 MERV 11 Pleated Air Filter, AC Furnace Air Filter, 12 Pack (Actual Size: 16 1/2" x 21 1/2" x 3/4") - Amazon.com
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