24" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Aluminum Just run your finger along

Just run your finger along the edge of the top plate and you’ll find a smooth finished surface

+ Product Details Size – 20"w X 30"h is the size for the duct opening measurement only

+ Product Details Size – 6"w X 14"h is the size for the duct opening measurement only

Actual Filter Size – 21 3/4"w x 27 3/4" x 1"

75"H – fits a 18" X 12" duct opening

24" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Aluminum Just run your finger along+ 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