8" x 28" or 28" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 30.5"] Compatible with Duct 8" actual front end outer dimensions

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

75"H – fits a 12" X 6" duct opening

actual front end outer dimensions are approximately 34 5/8" width X 26 5/8" height

+ Product Details Size - 30"w X 18"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 36 5/8" width X 26 5/8" height

8" x 28" or 28" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 30.5"] Compatible with Duct 8" actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 8" x 28" or 28" x 8" duct opening (measured at the opening), with actual outer dimensions of 10. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 7. 75" x 27. 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