18" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Supply Grille 75" width X 33

75" width X 33

Actual Filter Size – 19 3/4"w x 29 3/4" x 1"

Ideal for Walls & Ceilings: Designed for seamless installation in standard duct openings

+ Product Details Size - 20"w X 12"h is the size for the duct opening measurement only

actual front end outer dimensions are 19

18" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Supply Grille 75" width X 33+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 34" OR 34" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 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