Nordic Pure 18x24x4M14-2 Pleated AC Furnace Air Filter， Box of 2</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Actual Size: 17-1/2 by 23-3/88 by 3-3/4</li><li>Airflow (CFM) of 1968 at a Nominal Face Velocity (fpm) of 492 with a Resistance (in WG) of .39</li><li>Hypoallergenic and antimicrobial pleated electrostatic filter material</li><li>Recommended for newer units</li><li>Made in the USA</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/51e8SBHiNGL.jpg' noproxy></br>