26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Black + Product Details Size -

+ Product Details Size - 36"w X 36"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 18" OR 18" x 24" duct opening (measured at the opening)

Weather and Pest Proof – These louvers are especially designed to prevent water from entering your home

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 36" duct opening (measured at the opening)

26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Black + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 12" OR 12" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 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