The SPT-5 PAD 11"x11" by Koch Filter Corp is a versatile air filter pad designed for effective filtration in various environments. Each pad measures 11x11 inches and is sold in a bulk pack of 25, making it a cost-effective solution for maintaining air quality. Made from high-performance materials, this pad captures dust, pollen, and other airborne contaminants, ensuring cleaner air. Its lightweight design allows for easy handling and installation in compatible systems, making it ideal for both residential and commercial applications.