Nominal Size: 14 x 24 x 1, Actual Size: 13 3/4 x 23 3/4 x 3/4 (13.75 x 23.75 x 0.75) Advanced allergen reduction filters for both new and older HVAC units Low initial airflow resistance of 0.16 for maximum efficiency 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.