34" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12in diameter actual front end outer dimensions

actual front end outer dimensions are approximately 34 5/8" width X 18 5/8" height

built for durability and long life in mind

the gap will expand and retract to meet perfect air supply needed

+ Product Details Size - 12"w X 28"h is the size for the duct opening measurement only

For 8" Round Duct Opening - Spiral or Flex

34" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12in diameter actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 32" Or 32" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 34. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 31. 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