18x18x1

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KOCH 18x18x1 – 17-1/2×17-1/2×3/4 Pleated Air Filter, MERV 11.0
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KOCH 18x18x1 – 17-1/2×17-1/2×3/4 Pleated Air Filter, MERV 10.0
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KOCH 18x18x1 – 17-1/2×17-1/2×3/4 Pleated Air Filter, MERV 8.0
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