Premium permanent electrostatic washable air filters will keep your system clean and free of irritants for years to come. Lifetime permanent Electrostatic filters replace standard low efficiency “disposable filters” with no modification to the system. Cleaner air to breath, removes nearly 97% of pollen, dust and pollutants. Anti-microbial media inhibits the growth of bacteria & mold spores. A Lifetime Warranty is always included with your purchase.