Shopping Cart

Browse by Size:



Browse by Part #:

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

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
  • Free Shipping In Ontario & Quebec*
  • Pick Up In Store $140.00


Sold Out

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
  • Case of 4
  • Manufactured in Canada

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
  • Case of 4
  • Made in Canada