Cleaning vs Replacing 21.5x24x1 MERV 13 Filters
Pull a gray 21.5x24x1 filter from your return vent and the temptation makes sense. Rinse it off, let it dry, slide it back in, save the cost of a new one. We’ve run this test at FilterClarity.com more times than we’d like to count. The filter goes back in looking usable and immediately stops working … Read more