Northwest Enterprises Box Fan Filter For 20 Inch Box Fan, Disposable, 60 Day Filtration (Set of 2): Box Fan Not Included;

Install on the back of the fan for the best results! Our set of 2 Microfiber 20" x 20" box fan filters, filter the air in your home every time you turn your fan on. The unique fiber an design of these filters helps to trap airborne dust, pollen, dirt, pet hair, smoke and odors. Not only will you breathe easier, but you will dust less often. Fits easily on any 20" x 20" box fan with hook and loop tabs. Let your fan filter the air while airborne pollutants are trapped by the filter material. Set of 2. ***This does not include a box fan***. It is only a filter.*** Please check the dimensions of your fan before purchase. In order to work effectively, this will reduce air flow slightly.