28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Round Duct Pipe + Product Details Size –

+ Product Details Size – 14"w X 16"h is the size for the duct opening measurement only

75" width X 26

+ Product Details Size – 34"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 34"h is the size for the duct opening measurement only

+ Product Details Size - 14"w X 28"h is the size for the duct opening measurement only

28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Round Duct Pipe + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 12" OR 12" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 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