22" x 26" or 26" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in + Product Details Size –

+ Product Details Size – 40"w X 20"h is the size for the duct opening measurement only

Actual Filter Size – 31 3/4"w x 35 3/4" x 1"

+ Product Details Size – 24" x 34" or 34" x 24" is the size for the duct opening measurement only

The smooth

22" x 26" or 26" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 26" OR 26" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 25. 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