Naturalaire Micro Particle Pleated Furnace Filter Electrostatically Charged 100 Synthetic Wire Backed Media Clay Coated Frame Merv Rating 10 90 Day Filter Effective Against Pollen Dust Lint Dust Mites Pet Dander Mold Bacteria Virus Carriers Smoke Smog Lead Dust Features . Pack of 6 Specifications . Dimension 18 x 25 x 1 . Weight 4 20 lbs