8" x 34" or 34" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 36.5"] Material_Steel + Product Details Size –

+ Product Details Size – 24"w X 26"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 18 5/8" width X 8 5/8" height -

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+ Product Details Size - 28"w X 34"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 14 5/8" width X 8 5/8" height

8" x 34" or 34" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 36.5"] Material_Steel + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 8" x 34" or 34" x 8" duct opening (measured at the opening), with actual outer dimensions of 10. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 7. 75" x 33. 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