This is a 10 x 10 x 1 inch (25.4cm x 25.4 x 2.5) high performance pleated air filter. It has at least a 3-month longevity, outperforms glass disposable filters and has a durable moisture resistant frame. Its synthetic fibers do not support the growth of odor causing microbials and it is effective against dust mites, mold spores, pollen, and pet dander.