The Nordic Pure Ultra MERV 16 Pleated Air Filter is our highest-performance 1″ residential and commercial filtration option, engineered for environments where superior indoor air quality is essential. With 2.5× more filtration media, a Pro Strength reinforced 2-part frame, low airflow resistance, and exceptional ultrafine particle capture, Ultra MERV 16 sets a new standard for clean-air filtration in homes, medical offices, and fresh air environments. Proudly made in the USA.