20" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter sidewall + Product Details Size –

+ Product Details Size – 28"w X 26"h is the size for the duct opening measurement only

Ring Base Design – Allows for easy installation without removing the thermostat

Actual Filter Size – 27 3/4"w x 27 3/4" x 1"

Actual Filter Size – 17 3/4"w x 17 3/4" x 1"

20" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter sidewall + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 14" OR 14" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 13. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum