Filtrete 15x20x1 MERV 5 Dust Reduction HVAC L Air Filter 300 MPR 1 Filter 306-4 | eBay
Filtrete Ultra Allergen Air Filter 15x20x1 | Berings
Filtrete 15-in W x 20-in L x 1-in 12 MERV 1500 MPR Allergen, Bacteria and Virus Electrostatic Pleated Air Filter in the Air Filters department at Lowes.com