Merv 8 | ASHRAE Tested |Limited Lifetime Warranty | High 94% Dust Arrestance | Low 0.12" WG Air Resistance Rating | 300 FPM Flow | Fully Washable | Electrostatic | 165 grams Dust Holding Capacity PLUS | Premium quality extruded Metal Mesh | Gold anodized aluminum frame | Need to get in a tight spot? Check out Carter Flexible Frame Filters in all standard size's