24" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return Actual Front End Outer Dimensions

Actual Front End Outer Dimensions Are 14" Diameter

With these options

actual front end outer dimensions are approximately 22 5/8" width X 26 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 26" OR 26" x 24" duct opening (measured at the opening)

and smooth surface

24" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return Actual Front End Outer Dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 18" OR 18" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 17. 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