28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 12" or 12" x 8" duct opening (measured at the opening)

+ Product Details Size - 14"w X 14"h X 2"d (for duct opening measurement only)

+ Product Details Size – 30"w X 22"h is the size for the duct opening measurement only

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actual front end outer dimensions are approximately 14 5/8" width X 20 5/8" height -

28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 12" OR 12" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 11. 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