20X20X4 Tri Dim PRO Merv 9 HVAC four inch pleated air filter 3-pack (Discontinued)

20X20X4 Tri Dim PRO Merv 9 HVAC four inch pleated air filter 3-pack case. A new benchmark for pleated air filters - featuring mechanical MERV 9 performance at a very low, energy saving pressure drop -setting the standard for performance. This Filter captures small airborne particles such as fine dust, smoke, dander, mold and dust mites. Made in the USA. 20x20x4 Actual filter size: 19-1⁄2 X 19-1⁄2 X 3-3⁄4".