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20 x 20 x 4 (3 3/4") Furnace Filters

20x20x4 Furnace Air Filter MERV 8. Exact Size 19 3/8 x 19 3/8 x 3 5/8. Case of 4 by FurnaceFilters.Ca

In Stock

  • Standard 20 x 20 x 4 MERV 8 Rated Pleated Filters
  • Actual Size 19 1/2" x 19 1/2" x 3 3/4" 
  • Exact Replacement for 3M Filtrete 20 x 20 x 4 Air Cleaning Filter
  • Made In Canada by FurnaceFilters.Ca
  • Case of 4

    20x20x4 Furnace Air Filter MERV 11 Exact Size 19 3/8 x 19 3/8 x 3 5/8. Case of 4 by FurnaceFilters.Ca

    In Stock

    • 20 x 20 x 4 Pleated Filters
    • Actual Size 19 1/2" x 19 1/2" x 3 3/4"
    • Exact Replacement for 3M Filtrete 20 x 20 x 4 Air Cleaning Filter
    • MERV 11 Rated
    • Made In Canada by FurnaceFilters.Ca
    • Case of 4

    3M Filtrete 20 x 20 x 4. Case of 4

    Out of Stock

    • Genuine Original 3M Filtrete 20 x 20 x 4 
    • Actual Size 19 1/2" x 19 1/2" x 3 5/8" 
    • Equivalent to MERV 11
    • Case of 4


    Sold Out

    20x20x4 Furnace Filter 20 x 20 x 3 3/4" MERV 8 Filters. Case of 6

    In Stock

    • Standard 20 x 20 x 4  Pleated Filters
    • Actual/Exact Size 19 1/2" x 19 1/2" x 3 3/4"
    • MERV 8 Rated
    • Manufactured in Canada by Furnace Filters.Ca
    • Case of 6

    20x20x4 Furnace Filter 20 x 20 x 3.68" MERV 11 Filters. Case of 6

    In Stock

    • Standard 20 x 20 x 4  Pleated Filters 
    • Actual/Exact Size 19 1/2" x 19 1/2" x 3 3/4"
    • MERV 11 Rated
    • Manufactured in Canada by Furnace Filters.Ca
    • Case of 6

    Aerostar 20x20x4 MERV 13 Pleated Filter - Actual Size : 19-1/2 x 19-1/2 x 3-3/4 Inches - Case of 4

    In Stock

    • Standard 20 x 20 x 4  Pleated Filters 
    • Actual/Exact Size : 19 1/2" x 24 1/2" x 3 3/4"
    • MERV 13 Rated
    • Manufactured in Canada by Filtration Group
    • Case of 4