34" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in + Product Details Size –

+ Product Details Size – 8"w X 4"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 26 5/8" width X 32 5/8" height

actual front end outer dimensions are approximately 22 5/8" width X 20 5/8" height -

+ Product Details Size – 12"w X 12"h

34" x 8" 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 34" x 8" Or 8" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 7. 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