?x?x.50" Flat Electrostatic Filter (Between 501-550 sq. in.)ECAS050550 $97.40 SKU: ECAS050550 Back $97.40 Quantity -+ Add to Cart Details ?x?x.50" Flat Electrostatic Filter (Between 501-550 sq. in.) DetailsBackDetails?x?x.50" Flat Electrostatic Filter (Between 501-550 sq. in.)See MoreSee Less