AllergyZone Furnace Filter (4-pack) (20x25x1)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Polyolefin</li><li>Made in US</li><li>Improves indoor air quality</li><li>High-efficiency， disposable furnace filter for your home</li><li>Designed and recommended by leading allergy &amp; asthma physicians for symptom relief</li><li>Proven effective in clinical trials</li><li>Converts your home's heating and air-conditioning system into a whole house air cleaner</li></ul></div><img src="http://ecx.images-amazon.com/images/I/61pG%2B%2BFwpAL.jpg" noproxy>