26" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Wood Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard duct openings

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 24" OR 24" x 20" duct opening (measured at the opening)

Actual Front End Outer Dimensions Are 10" Diameter

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+ Product Details Size - 24"w X 32"h is the size for the duct opening measurement only

26" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Wood Ideal for Walls & Ceilings:+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 20" OR 20" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 19. 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