24" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter d + Product Details Size -

+ Product Details Size - 36"w X 10"h is the size for the duct opening measurement only

+ Product Description Introducing the Louver Floor Register from HVAC Premium – your gateway to enhanced home comfort and style

this guard is designed to provide maximum protection against tampering while maintaining a clean and professional appearance

A: Black Grilles Always Look Sharp And Never Show DIrt & Dust Marks

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 26" OR 26" x 18" duct opening (measured at the opening)

24" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter d + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 36" OR 36" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 35. 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