The Carrier KFAFK0212MED / 317659-408 Bottom Air Filter is an OEM-quality replacement designed to maintain clean airflow in a wide range of Carrier HVAC systems. Measuring 16-1/2" x 21-1/2" x 1", this filter captures dust, debris, and airborne particles to protect internal components, improve system efficiency, and maintain optimal indoor air quality. It is the ideal replacement for clogged, damaged, or overdue filters. Key Features OEM-compatible bottom air filter for Carrier HVAC units Dimensions: 16-1/2" x 21-1/2" x 1" Improves airflow efficiency and reduces strain on blower components Enhances indoor air quality by trapping dust and contaminants Durable filter media for long-lasting performance Easy installation in bottom filter housings Specifications Part Numbers: KFAFK0212MED / 317659-408 Component Type: Bottom Air Filter Filter Size: 16-1/2" x 21-1/2" x 1" Application: Carrier heating and cooling systems Function: Removes airborne particulates and protects internal components Compatible Models (shortened list) Carrier 40FKA002 310 Carrier 40FKB002 300 Carrier FA4ANC030005AAAA Carrier FA4ANC030005AEAA Carrier FA4ANC030005AFAA Carrier FA4ANC030005AGAA Carrier FA4ANC030008AEAA Carrier FA4ANC030008AFAA Carrier FA4ANC030008AGAA ?and 547+ more. Why Choose This Item Choose this bottom air filter to restore proper airflow, protect HVAC components, and improve air quality. With precise OEM sizing, high filtration performance, and broad system compatibility, it?s the ideal replacement for maintaining efficient, long-lasting Carrier HVAC operation.