18" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return Grille powder-coated finish adds a touch

powder-coated finish adds a touch of elegance while also being scratch-resistant

actual front end outer dimensions are approximately 16 5/8" width X 30 5/8" height

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

18" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return Grille powder-coated finish adds a touch+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 16" OR 16" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 15. 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