32" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in only measure the "hole" in

only measure the "hole" in the wall/duct

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 28" OR 28" x 24" duct opening (measured at the opening)

+ Why HVAC Premium

+ Product Details Size – 20" x 34" or 34" x 20" is the size for the duct opening measurement only

32" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in only measure the "hole" in+ Product Details Perfect Fit & Easy Sizing Designed for a 32" x 12" OR 12" x 32" duct opening (measured at the opening), with actual outer dimensions of 34. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 31. 75" x 11. 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