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Every grille has a front end frame
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4" X 10" Is The Size For The Duct Opening (floor/vent hole) Measurement Only
actual front end outer dimensions are approximately 11
+ Product Details Size – 14"w X 4"h is the size for the duct opening measurement only
12" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w25h25 Every grille has a front+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 20" or 20" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 19. 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