34" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Supply Grille + Product Details Size –

+ Product Details Size – 30"w X 32"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 28 5/8" width X 14 5/8" height

12"w X 4"h Is The Size For The Duct Opening Measurement Only

actual front end outer dimensions are approximately 36 5/8" width X 32 5/8" height

Design – Fixed Hinged for easy filter change & cleaning - uses a 1" thick filter

34" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Supply Grille + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 26" Or 26" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 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