20" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return Grille + Product Details Size –

+ Product Details Size – 16"w X 16"h is the size for the duct opening measurement only

Actual Filter Size – 35 3/4"w x 33 3/4" x 1"

+ Product Details Size - 14"w X 18"h is the size for the duct opening measurement only

+ Product Details Size - 24"w X 30"h is the size for the duct opening measurement only

20" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return Grille + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 16" OR 16" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 15. 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