![3M Filtrete 1000 MPR Furnace Fibreglass Allergen Reduction Air Filter - 20 x 20 x 4-in DP02DC-4-C | RONA 3M Filtrete 1000 MPR Furnace Fibreglass Allergen Reduction Air Filter - 20 x 20 x 4-in DP02DC-4-C | RONA](https://cdn.rona.ca/images/02095246_L.jpg)
3M Filtrete 1000 MPR Furnace Fibreglass Allergen Reduction Air Filter - 20 x 20 x 4-in DP02DC-4-C | RONA
![United Filter 20x20x4 MERV 8 Furnace Filters - (Case of 4) HVAC Filters Purify Air, Removes Pollen, Mould, Bacteria & Smoke - Made in Canada : Amazon.ca: Tools & Home Improvement United Filter 20x20x4 MERV 8 Furnace Filters - (Case of 4) HVAC Filters Purify Air, Removes Pollen, Mould, Bacteria & Smoke - Made in Canada : Amazon.ca: Tools & Home Improvement](https://m.media-amazon.com/images/I/81jfu1UfQOL.jpg)
United Filter 20x20x4 MERV 8 Furnace Filters - (Case of 4) HVAC Filters Purify Air, Removes Pollen, Mould, Bacteria & Smoke - Made in Canada : Amazon.ca: Tools & Home Improvement
![BNX TruFilter 20x20x4 (19 1/2'' x 19 1/2'' x 3 5/8'') MERV 13 Air Filter (SlimFit) (2-Pack) - MADE IN USA - Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Health, BNX TruFilter 20x20x4 (19 1/2'' x 19 1/2'' x 3 5/8'') MERV 13 Air Filter (SlimFit) (2-Pack) - MADE IN USA - Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Health,](https://m.media-amazon.com/images/I/81klKKT03cL.jpg)
BNX TruFilter 20x20x4 (19 1/2'' x 19 1/2'' x 3 5/8'') MERV 13 Air Filter (SlimFit) (2-Pack) - MADE IN USA - Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Health,
![Filterbuy 20x20x4 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches) : Amazon.ca: Home Filterbuy 20x20x4 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches) : Amazon.ca: Home](https://m.media-amazon.com/images/I/81OaIBD3LBL._AC_UF894,1000_QL80_.jpg)
Filterbuy 20x20x4 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches) : Amazon.ca: Home
![Filtration Lab® Maxi Pleat Pleated Furnace Filter 20x20x4 - Furnace Filters - Forest City Surplus Canada - discount prices Filtration Lab® Maxi Pleat Pleated Furnace Filter 20x20x4 - Furnace Filters - Forest City Surplus Canada - discount prices](https://fcsurplus.com/home&office/images/110007web.jpg)
Filtration Lab® Maxi Pleat Pleated Furnace Filter 20x20x4 - Furnace Filters - Forest City Surplus Canada - discount prices
![Filterbuy 20x20x4 Air Filter MERV 13 Optimal Defense (6-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches) : Amazon.ca: Home Filterbuy 20x20x4 Air Filter MERV 13 Optimal Defense (6-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches) : Amazon.ca: Home](https://m.media-amazon.com/images/I/71n-NkNi8eL._AC_UF894,1000_QL80_.jpg)
Filterbuy 20x20x4 Air Filter MERV 13 Optimal Defense (6-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches) : Amazon.ca: Home
![Filtrete 20x20x4 Furnace Filter, MPR 1000, MERV 11, Healthy Living Ultimate Allergen 3-Month Pleated 4-Inch Air Filters, 4 Filters : Amazon.ca: Tools & Home Improvement Filtrete 20x20x4 Furnace Filter, MPR 1000, MERV 11, Healthy Living Ultimate Allergen 3-Month Pleated 4-Inch Air Filters, 4 Filters : Amazon.ca: Tools & Home Improvement](https://m.media-amazon.com/images/I/81iAEM7winL._AC_UF894,1000_QL80_.jpg)