This is an electrostatic air filter for your heating/cooling unit. this filter will trap pet dander, odors and pollen. It last about 4 months and then you simply replace it. It also has 3-way odor control, the carbon in this filter traps all of the bad stuff and keeps it from circulating all through your home in the duct work. It also contains OGuard, which is an advanced odor reduction ingredient. If you have pets in your home this is a must! It also has allergen particle reduction and Micro ban, it fights microbes that collect on filters and that causes odors. This fits all systems and is adjustable from 10x10 up to a 20x25 opening. You can remove the blue portion of the filter and wash it out every so often and when it is completely dry you insert it back into the frame. Do NOT wash the gray part, that is the side that contains the charcoals and carbon.
This product is so worth the small investment, it will extend the life of your heating and cooling unit, it will keep your home almost dust free and help reduce illness and allergy outbreaks.