12" x 34" or 34" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line + Product Details Size –

+ Product Details Size – 8" x 14" or 14" x 8" is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 24" or 24" x 6" duct opening (measured at the opening)

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actual front end outer dimensions are approximately 30 5/8" width X 18 5/8" height

12" x 34" or 34" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 34" or 34" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 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