In addition to catching pollen, dust, pet dander, pet hair and fur with MERV 8 efficiency, Colorfil furnace + air conditioning filters remove and neutralize odors and chemicals from the gas phase, binding them without releasing any harmful byproducts. Colorfil was originally built for NASA and designed to meet rigorous performance and safety requirements to help protect astronauts and spacecraft. Now available for everyday use, our filters are recommended for homes to help create clean, fresh, and welcoming living spaces for pets and their humans. Our filters are not scented, so you get advanced odor control without activated carbon, charcoal, or baking soda, and without covering up smells like a whole home air freshener or spray. Colorfil is the only filter that shows you when its working, changing color from pink to yellow as it captures and neutralizes odors in your air! When selecting an air filter for your a/c, heater, or HVAC system, make sure to compare the nominal and actual size of the furnace filter that you are replacing. The nominal size is typically in larger print and rounded to whole numbers, while the actual or exact size is in smaller print or in parenthesis. Exact size may also be easily identified with the help of a ruler or measuring tape. - A PERFECT, PINK, PET-FRIENDLY AIR FILTER - MADE IN THE USAPets are awesome, but lets be completely honest here--they dont do us any favors when it comes to air quality. High-efficiency, dynamic air conditioner filters by Colorfil were designed specifically to help you enjoy the happiest moments with your pets, with none of the odors. - NASA-GRADE FILTRATION AT YOUR FINGERTIPSThats one small step for man, and one giant leap for home filtration! Colorfils 24x24x1 air filter technology was originally built to protect astronauts and spacecraft from nasty gases and odors. You could say were the only air filter company that is literally out of this world. - COLOR-SHIFT TECHNOLOGY, A BAD SCENTS WORST ENEMYColorfils remarkable home air filter acts as the most feared and respected bouncer at a club it lets in the good, and keeps out the bad. Whether its dust, dirt or that pesky pet hair your four-legged friends leave behind, we filter it all to keep you and your loved ones healthy and happy. - WHEN ITS TIME FOR A CHANGE, IT LETS YOU KNOWOur 24x24 air filter can be seamlessly inserted into air conditioning units, heaters, or other HVAC systems. The bright pink color-shift technology will slowly change to yellow with use as it absorbs and neutralizes gas-phase odors from your air. So as the color changes, you know that your Colorfil air filter is working hard to keep your air clean. - COLORFIL, YOUR NOSES NEW BEST FRIENDWe pride ourselves on delivering a one-of-a-kind odor eliminator with no added scents. Products like whole house air fresheners, candles and sprays usually cover up odors with fragrances, and thats just not us. We aim to provide a clean and natural scent to your living environment, filtering air the right way so that you can enjoy pure quality time with your furry friends and loved ones.