Merv 13 Pleated Air Filter - 19 7/8" x 21 3/8" x 1" Quantity:12-pack Filtering inserts are shipped in

Filtering inserts are shipped in an easily stored packet

The "Practical Pleat" contains over 500% greater surface area than a MERV 10 one-inch pleat

To find the size the old unit should have sizing information printed on it

One way to overcome this problem is to increase the surface area of the filter media

Merv 13 Pleated Air Filter - 19 7/8" x 21 3/8" x 1" Quantity:12-pack Filtering inserts are shipped inAny Kind of Filter's Extended Surface Pleated Filters outperform ordinary furnace filters with medium efficiency and are designed for lower pressure drop, and long service life which reduces HVAC equipment maintenance and energy costs. A higher MERV rating means that the air filter that you are about to purchase possesses a higher amount impurity filtration ability than your ordinary filter.