The Carrier CPFILTRK007A00 Filter Top/Bottom Rack is an HVAC filter rack designed to accommodate a 12" x 20" x 1" air filter in compatible heating and cooling systems. It securely holds the filter in position, allowing air to pass through while the filter captures airborne dust, dirt, and other particles. Commonly used in compatible Carrier air handlers, furnac https://www.partshnc.com/cpfiltrk007a00-carrier-filter-top-bottom-rack-12-x-20-x-1