Asked by: Diosinda Lastaolahome and garden indoor environmental quality
Can you cut air filters to size?
In this regard, what if my air filter is too big?
If you purchase a filter that's too large, it won't slide into the slot correctly. If the filter is too small, it won't cover the entire space and may allow dust and dirt to flow past.
Keeping this in view, can I use a 4 inch filter instead of 5?
No way! You just need the right kind of high MERV filter. A thicker filter (4-5 inches) has more surface area and therefore allows more room for air to pass through. Do this: If you're really interested in keeping your air clean, we'd suggest you get an air cleaner/purifier installed in your air ducts.
The filters don't need to fit with an “air tight” seal, but you should be able to easily install and uninstall your filter without a struggle, plus the filter shouldn't be so small that it moves freely within your unit.