The Grainger 170FT2 is a high-performance, heavy-duty, industrial-grade air filter with a MERV rating of 13. It measures 20x20x2 inches and is made in the USA. This pleated polyester media filter has an arrestance efficiency of 90-92% and is recommended for commercial and industrial HVAC systems. With its deep pleat design, it provides low air flow resistance. This filter traps tiny particles down to 1-3 microns in size including dust, pollen, mold spores, bacteria, and smoke. It's UL Classified and can handle air flow up to 500 feet per minute. The 170FT2 helps optimize air quality and protects HVAC equipment in factories, warehouses, schools, hospitals and more.