MicroDefense by Honeywell CF100A1620/U Honeywell Filter， 4 inch， 16 x 20， Merv 8 Microdefense， 16 x 20 x 4</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Easy flow Micro defense energy efficiency filters air particles such as pollen， dust， mold spores， common allergens， clothing fibers and carpet fibers</li><li>Heavy duty Frame with reinforced filter</li><li>MERV 8 filter rating is up to 20 times more efficient than a typical fiberglass filter without obstructing air flow</li><li>Filter may last up to 3 months， but many filters need to be replaced sooner – check your filter often because a dirty filter may reduce your system performance and air flow</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/41Ak%2BLMVC%2BL.jpg' noproxy></br>