Holmes Total Aer1 Filter, Single-Pack: * HEPA-type filtration effectively removes up to 99 percent of particles (as small as 2 microns) from air passing through filter * Proven to trap and lock 30 percent more dust and particles in your home * Infused with Arm & Hammer baking soda for odor-elimination * Benefits of replacement filters over permanent filters: * Ensure optimal filter performance  free of debris and build-up found in permanent filters * No cleaning required, simply toss dirty filter into the garbage * Cleaning permanent filters releases captured dust and pollen back into the air to be breathed back in * For use with Holmes Air Purifier models HAP9242, HAP9414 and HAP9422 * Dimensions: 10.0"L x 4.5"W x 1.3"H * Model# HAPF30ATPDQ-U4 * Aer1 filter system also provides customizable filter solutions perfect for any problem including: * Total Air for dust elimation * Odor Eliminator and Allergen Remover ideal for allergy sufferers