NaturalAire Standard Air Filter， MERV 8， 21 x 21， 1-inch， 12-Pack</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Pack of 12 quality filters designed for protection of furnace and central air units</li><li>MERV 8 rating: Removes household dust， pollen， dirt， mold spores and more</li><li>Pleated media provides large surface area for more effective filtration while keeping airflow resistance low</li><li>Each filter maintains efficiency for up to 90 days</li><li>Compatible with HVAC systems requiring filters sized 21" x 21"</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/51J-u5UunSL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51ZYF3NzprL.jpg' noproxy></br>