30" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w6h6 + Product Details Size -

+ Product Details Size - 20"w X 20"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 12 5/8" width X 20 5/8" height

actual front end outer dimensions are approximately 14 5/8" width X 26 5/8" height

display: block

actual front end outer dimensions are approximately 32 5/8" width X 28 5/8" height

30" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w6h6 + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 29. 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 Made from