The DUO PAK 40 1 PLY filter, sized 20x20x11, is a single-ply air filter from Koch Filter Corp, designed for effective filtration in HVAC systems. This filter features a unique design that maximizes airflow while capturing dust and allergens. Its 11-inch depth provides ample surface area for dust collection, ensuring longevity and performance. Each carton contains 5 filters, making it an economical choice for regular maintenance.
