Nominal Size: 10 x 20 x 1, Actual Size: 9 1/2 x 19 1/2 x 3/4 (9.5 x 19.5 x 0.75) Ultimate allergen and airborne particle reduction Great for Residential and Commercial HVAC units More surface area than standard pleats so it lasts longer. Made in the USA: Proudly manufactured in the USA, ensuring quality and supporting local production. Provides advanced particle capture without compromising airflow, boosting your HVAC system’s efficiency and air quality.