16" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return grille actual front end outer dimensions

actual front end outer dimensions are approximately 16 5/8" width X 32 5/8" height

+ Product Description Upgrade your HVAC system with our 5" Round Air Vent Supply Grille

+ Product Details Size - 26"w X 4"h is the size for the duct opening measurement only

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actual front end outer dimensions are approximately 12 5/8" width X 18 5/8" height

16" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return grille actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 20" OR 20" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 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