8" x 26" or 26" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 28.5"] Compatible With Duct 10in + Product Details Size –

+ Product Details Size – 20"w X 26"h is the size for the duct opening measurement only

actual front end outer dimensions are 19" Width X 19" Height

75"H – fits a 16" X 4" duct opening

+ Product Details Size - 14"w X 30"h is the size for the duct opening measurement only

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8" x 26" or 26" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 28.5"] Compatible With Duct 10in + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 8" x 26" or 26" x 8" duct opening (measured at the opening), with actual outer dimensions of 10. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 7. 75" x 25. 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