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