18" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w26h26 + Product Details Size –

+ Product Details Size – 22" x 24" or 24" x 22" is the size for the duct opening measurement only

+ Product Details Size – 10" X 4" is the size for the duct opening (floor/vent hole) measurement only

Actual Filter Size – 15 3/4"w x 24 3/4" x 1"

Our T bar drop ceiling grills are renowned for their exceptional 360-degree airflow capability

18" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w26h26 + Product Details Size –+ 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