Nominal Size: 12 x 12 x 1, Actual Size: 11 3/4 x 11 3/4 x 3/4 (11.75 x 11.75 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.