12" x 28" or 28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 10" 75"H – fits a 18"

75"H – fits a 18" X 18" duct opening

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and extends HVAC system life

+ Product Details Size – 8"w X 30"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 36"h is the size for the duct opening measurement only

12" x 28" or 28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 10" 75"H – fits a 18"+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 28" or 28" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 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