24" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w18h18 75"H – fits a 20"

75"H – fits a 20" X 18" duct opening

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

Scratch-Resistant

+ Product Details Size – 12" x 18" or 18" x 12" is the size for the duct opening measurement only

24" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w18h18 75"H – fits a 20"+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 34" OR 34" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 33. 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