22" x 18" 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 5

actual front end outer dimensions are approximately 27

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+ Product Details Size - 14"w X 18"h is the size for the duct opening measurement only

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22" x 18" 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 18" OR 18" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 17. 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