14" x 28" or 28" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12in diameter + Product Details Size –

+ Product Details Size – 12"w X 18"h is the size for the duct opening measurement only

Installation Location – Sidewall and ceiling

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875" width X 10" height

+ Product Details Size - 30"w X 30"h X 2"d (for duct opening measurement only)

14" x 28" or 28" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12in diameter + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 28" OR 28" X 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 75" x 27. 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