Replacement aluminum air cleaner filter made by Filter Everything and compatible with Emerson /White-Rodgers/ Electro-Air SST 16C28S -. Dimensions measure 10-1/2 x 20-1/4 x 5/16 inches. Sold as a 2-Pack. Our filters are manuctured to meet or exceed OEM quality and are fully compatible with the name brand (OEM) model. Aluminum filters should be cleaned every 60-90 days; carbon filters should be replaced every 6-9 months. Proudly packed and shipped from our facility near Cleveland, OH.