8" x 24" or 24" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 26.5"] 10in diameter + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 14" or 14" x 6" duct opening (measured at the opening)

Design – This airflow control component are made to connect to HVAC diffuser and restrict airflow

making it ideal for preventing tampering or unauthorized adjustments

actual front end outer dimensions are 25

+ Product Details Size - 20"w X 25"h is the size for the duct opening measurement only

8" x 24" or 24" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 26.5"] 10in diameter + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 8" x 24" or 24" x 8" duct opening (measured at the opening), with actual outer dimensions of 10. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 7. 75" x 23. 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