6x14x1 Electrostatic Washable Permanent A/C Furnace Air Filter The only lab-certified MERV 9 electrostatic washable filter. This means it has been tested and traps particles down to 1.0 microns. That includes Allergens like Mold, Dust Mite Debris, Pollen, Pet Dander and Smoke. Lab report is available upon request. Not all electrostatic filters are equal. This state of the art filter contains cutting edge media that allows for MERV 9 particle arrestance. Pleated design allows 40% more surface area. This filter does not require electricity. It develops a natural static charge when air passes through it. This charge captures and holds dust and allergens until washed or vacuumed off. Pays for itself in 1 year. Never buy another filter. Lifetime Warranty. 100% Satisfaction Guarantee Watch out for overseas counterfeits! A Genuine MaxMERV 9 filter is made in the USA and has a rust-proof aluminum frame, corrugated outer screen and a unique blue and white label.