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25x29x4 Air Filter MERV 8 vs MERV 11: The $20 Step on a 3 Pack

A 25x29x4 air filter MERV 8 3 pack is...

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12x25x2 Air Filter MERV 11 vs MERV 13: What $21 More Buys in Fine Particle Capture

A 12x25x2 air filter MERV 11 box of six...

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MERV 13 in a 20x25x5 Furnace Cabinet: What the Upgrade Costs

MERV 13 in a 20x25x5 cabinet adds $10.00 to...

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