Purchased to use as a room air dust filter on a 20 x 20 case fan. These filters differ from others in that they are nominal size. 20 x 20 means it's actually 20" x 20" on both sides. Many other popular brands are 19.5 x 19.5 in size. A slightly smaller size might help some people with space issues, but no more for my purposes. They seem to pick up a lot of dust and will pick up more over time (at the cost of less airflow).
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