Your browser is out-of-date!

Update your browser to view this website correctly. Update my browser now

4 Inch Furnace Filters

PureFilters carries a wide variety of 4 inch furnace air filters. All of our 4 inch filters are manufactured here in Canada and are made with high quality materials. The 4 inch furnace filters we carry are the pleated kind, providing a superior level of indoor air quality.

4 Inch Furnace Filter MERV Ratings

We offers a range of MERV ratings for 4 inch filters. If you are unsure of which MERV rating is suitable for your home, be sure to check out our MERV Rating Guide. You can also see a quick comparison chart here:

How Often To Change 4 Inch Filters

The frequency of 4 inch filter changes will highly depend on what is inside your home, where you are located and various other factors. We wrote a Filter Change Frequency Guide which will help you decide when it is time to change your furnace filter.

4 Inch Furnace Filter Size

It's important to know the difference between nominal size and actual or exact size. We wrote a Guide for Furnace Filter Sizes, if you are not sure what the size of your 4 inch filter is, we recommend checking it out.

"4 inch" refers to the thickness of the filter. Please see the image below, the third image shows how to measure the thickness of your filter:

Below, you can see a list of all 4 inch filter sizes (nominal sizes) we currently have listed in our store:

10x10x4

10x14x4

10x15x4

10x16x4

10x18x4

10x20x4

10x24x4

10x25x4

10x30x4

12x12x4

12x15x4

12x16x4

12x18x4

12x20x4

12x22x4

12x24x4

12x25x4

12x26x4

12x27x4

12x30x4

12x36x4

13x18x4

13x20x4

13x21x4

13x24x4

14x14x4

14x18x4

14x20x4

14x22x4

14x24x4

14x25x4

14x27x4

14x28x4

14x30x4

14x36x4

15x15x4

15x20x4

15x25x4

15x30x4

16x16x4

16x18x4

16x20x4

16x21x4

16x22x4

16x24x4

16x25x4

16x30x4

16x32x4

16x36x4

17x17x4

17x19x4

17x20x4

17x21x4

17x22x4

17x25x4

18x18x4

18x20x4

18x22x4

18x24x4

18x25x4

18x30x4

18x36x4

19x19x4

19x21x4

19x22x4

19x23x4

19x27x4

20x20x4

20x21x4

20x22x4

20x23x4

20x24x4

20x25x4

20x27x4

20x30x4

20x32x4

20x34x4

20x36x4

21x21x4

21x22x4

21x23x4

22x22x4

22x24x4

22x26x4

22x28x4

22x36x4

23x25x4

24x24x4

24x25x4

24x28x4

24x30x4

24x36x4

25x25x4

25x28x4

25x29x4

25x32x4

27x27x4

28x30x4

29x29x4

30x30x4

30x36x4

8x14x4

8x16x4

8x20x4

8x24x4

8x30x4

 

Request Custom Size Furnace Filter

If you still cannot find your furnace filter listed on our store, you can always request a custom size filter. Custom size filters can take up to 15 business days to deliver and all custom size filter sales are final (no refunds/exchanges). In order to request a custom size filter and receive a quote for your order, please click on the link below.

Request custom size filter

If you need help finding your exact filter on PureFilters.ca and prefer to speak to someone, please give us a call at 1-888-979-4284 or email us at support@purefilters.ca. We are available Monday to Friday from 9AM to 5PM Eastern Standard Time.