22" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Round Duct Pipe actual front end outer dimensions

actual front end outer dimensions are approximately 24 5/8" width X 18 5/8" height

+ Product Details Size – 18"w X 34"h is the size for the duct opening measurement only

improves airflow

+ Product Details Size – 16"w X 10"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 24 5/8" width X 28 5/8" height

22" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Round Duct Pipe actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 28" OR 28" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 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