28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter actual front end outer dimensions

actual front end outer dimensions are approximately 36 5/8" width X 34 5/8" height

actual front end outer dimensions are approximately 24 5/8" width X 8 5/8" height

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

actual front end outer dimensions are approximately 26 5/8" width X 28 5/8" height

28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter actual front end outer dimensions+ 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