BestAir 25 in. W x 20 in. H x 4 in. D 13 MERV Pleated Air Filter (Pack of 3) tier discount 11 Perlite is a natural mineral Perlite is a natural mineral used to improve the drainage and aeration of any growing mix ISO Male Tip to a IH Female Body Manufacturer Part No: HW2025 13R Brand Name: BestAir *Thickness: 4 *Electrostatic: *Filter Class: *Filter Frame Material: *Filter Material: *Filters Bacteria: Yes *Filters Pollen: Yes *Filters Smoke: Yes *Filters Viruses: Yes *High Efficiency: Yes *Metal Mesh Support: *Number in Package: 1 *Pleated: Yes *Product Type: Air Filter *Sub Brand: *Trimmable: No *Width: 25 *Filters Dust Lint: Yes *Filters Mold Spores: Yes *Height: 20 *MERV MPR Rating: 13 *Actual Size: 20 x 25 x 1 *Air Filter Size: 20x25x4