I rent my house and have two custom sized wall vents that require filters. My only option other than custom ordering (which I don't want to do) was a sized filter. I chose this brand because it is more eco-friendly than some other filters as you can wash the filters. I have used this product in both air vents in my house for three years. I've always been amazed at how committed they are to it. One pack lasted almost 3 years, rinsed and dried monthly and then completely replaced once a quarter. As a tip for cutting out, first measure the vent and cut out the cardboard template (use the Amazon box it comes in!). Then store the filter in plastic (or remove it and take it outside) and use sharp kitchen scissors to cut it for template. Save the pattern and repeat. Cutting without plastic, especially indoors, is REALLY DIRTY so save yourself the extra cleaning by learning from my trial and error. To clean I take them outside and shake them out, then rinse them with dish soap in the sink, let them dry completely and put them back in. It's very easy. I just bought another pack so hopefully see you in another 3 years!
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