BestAir SG413-BOX-13R Furnace Filter, 16" x 28" x 4", Aprilaire 413 Replacement, MERV 13 MERV 13 Removes 99% of particles up to 10 microns: Dust/Lint, Pollen, Dust Mite, Dander, Mold Spores, Bacteria, Smoke, Virus Carriers, Smog, Odors Fits Aprilaire SPACE GARD 4400, 2410, 413, and the following models with upgrade kits #1213: 2400 & 2140; includes cardboard frame Hypoallergenic, Micro Free electrostatic deep pleated media to optimize particulate capture rate and minimize pressure drop on your HVAC system Easy to install - Just slide in and that's it! No lining up rails no awkward bending Lasts up to 12 months & Proudly Made in the USA