FilterTime 20x20x1, AC Furnace Air Filter, MERV 11, 4-Pack (exact dimensions 19.5 x 19.5 x 0.75) , AC Filter, Furnace Filter, Home Air Filter Made in USA FilterTime is owned by former NASCAR drivers, Blake Koch and Dale Earnhardt Jr. They understand the importance of having clean, fresh air in their homes and are committed to delivering top-quality home air filters fast directly to your doorstep. Take air filters off your to-do list for good. Our standard 1" & 2" air filters are made out of the highest quality materials and come in a variety of different grades based on your needs. We even carry options for pet owners and individuals who suffer from allergies. Each grade of standard air filters are assigned a MERV rating for efficiency. Most of our air filters are made from pleated media which capture large particles from the air you breathe.