20x18x2
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20x18x2 MicroMAX Edge Air Filter – MERV 12, Box Style, Koch 120-712-1820
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20x18x2 MicroMAX Edge Air Filter – MERV 14, Box Style, Koch 120-710-1820
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Koch 102-082-015 – 20x18x2 Extended Surface Pleated Air Filter, MERV 11
$234.12 per 12 pcs ($19.51 each) -
Koch 102-092-015 – 20x18x2 Extended Surface Pleated Air Filter, MERV 11
$191.88 per 12 pcs ($15.99 each)