28" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling actual front end outer dimensions

actual front end outer dimensions are approximately 18 5/8" width X 14 5/8" height -

+ Product Details Size – 6" x 28" or 28" x 6" is the size for the duct opening measurement only

+ Product Details Size - 36"w X 18"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 32 5/8" width X 36 5/8" height

+ Product Details Size - 20"w X 8"h is the size for the duct opening measurement only

28" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 6" OR 6" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 5. 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