The air inside your home can be even dirtier than the air outside in the environment, and a high-quality air conditioning and furnace filter can help improve the quality of the air that you breathe. Each K&N lifetime washable home furnace filter is engineered to provide exceptional MERV 11 capturing capability for airborne contaminants such as smoke particles, bacteria, mold, spores, dust mites, and carpet fibers—and helps protect your family from allergens including pollen, pet dander, and dust. K&N washable home air filters are made with specially-designed filtration media that can be washed and reused as often as necessary, allowing you to avoid replacing and disposing of dirty filters month after month saving money and helping  to keep the environment cleaner.