Air Filters MERV 11 Electrostatic Pleated HVAC Furnace Filter 4-Pack 20 x 25 x 4 High-Efficiency Purification Multi-Layer Filtration Superior Compatibility Stable and Durable Wide Application Long-Lasting Performance Folded Item Dimensions(LxWxH): 25.20 x 3.98 x 4.33 in / 640 x 101 x 110 mm,Nominal Dimensions: 20 x 25 x 4 in,Filtration Grade: MERV 11,Plastic Body with Screws Width: 3.98 in / 101 mm,Number of Pieces: 4,Expanded Height: 20.47 in / 520 mm,Item Model Number: SEN-06,Item Length: 25.20 in / 640 mm,Plastic Body Width: 3.82 in / 97 mm,Net Weight: 14.11 lbs / 6.4 kg,Expanded Item Dimensions(LxWxH): 25.20 x 3.98 x 20.47 in / 640 x 101 x 520 mm