3 Inch Furnace Filters

PureFilters only carries a small selection of 3 inch furnace air filters. All of our 3 inch filters are either manufactured here in Canada or sourced directly from the brand manufacturer. The 3 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 3 inch filters we currently have listed in our store:

Lennox X0581 - BMAC Furnace Filter 16x25x3 MERV 11

Generalaire / Reservepro 4521 - Furnace Filter 16x25x3 MERV 8

Lennox X5423 - Furnace Filter 16x26x3 MERV 11

3 Inch Furnace Filter MERV Ratings

We offers a range of MERV ratings for 3 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 3 Inch Filters

The frequency of 3 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.

3 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 3 inch filter is, we recommend checking it out.

"3 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 3 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.

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.