34" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 8" + Product Details Size –

+ Product Details Size – 18" x 22" or 22" x 18" is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 32" x 12" OR 12" x 32" duct opening (measured at the opening)

actual front end outer dimensions are approximately 12 5/8" width X 30 5/8" height

actual front end outer dimensions are approximately 22 5/8" width X 36 5/8" height

34" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 8" + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 12" Or 12" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 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