EcoHelp HEPA Filter for Ecoquest Alpine Living Air Classic XL-15 and Fresh Air by Ecoquest High Quality HEPA Filter Size: 7" x 6.5" x 2.25" Life Span: 3 month For Ecoquest, Alpine, Living Air Classic XL-15 and Fresh Air by Ecoquest Works with Fresh Air 1.5 (Not for Fresh Air 2.1)