If you're looking to reduce the amount of lint and dust particles floating through the air in your home, Filtrete basic pleated dust filters can help. In fact, these 3M filters are a great way to purify the air so that you can breathe better. Each filter measures 20 inches long by 20 inches wide, carries a Microparticle Performance Rating of 100 and can last up to 3 months. What's more, these non-electrostatic air filters outperform fibreglass filters and come in packs of 2 so you'll always have a replacement ready when it's time to change your filter. Recommended for residential use only.