4 Inch Furnace Filters

Replacement 4 inch air filters available in standard, hard-to-find and custom sizes.

  • Available in Standard and Custom Sizes
  • Superior Quality, Best Prices Guaranteed
  • High Filtration Efficiency, Move To MERV 13
  • Improve Your Home's Air Quality By Upgrading Your MERV Rating
  • Changing Your Filters Keeps Energy Costs Down By Up To 15%
4 Inch Furnace Filters

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Important Information


The manufacturer has discontinued the MERV 6 / APR 450 filters from their line up, our suggested replacement is the MERV 8 / APR 650 Gold filter, you may see the Emerald MERV 6 / APR 450 still on the website, we are actively removing that MERV/APR


** The typical ship time for orders is now around 15 to 20 business days **

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