The MG400 MASTER LINK filter, measuring 25W x 20L inches, is a premium product from Koch Filter Corp. This filter is engineered for superior air filtration, making it ideal for various HVAC applications. Each carton contains 1 filter, ensuring you have a reliable option for maintaining air quality. Constructed with high-quality materials, it meets industry standards for performance and durability. The filter's design allows for easy installation and replacement, ensuring optimal airflow and filtration efficiency in your system.