18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter fixed bar With a solid base for

With a solid base for stability

+ Product Details Size – 25"w X 26"h is the size for the duct opening measurement only

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2" X 10" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter fixed bar With a solid base for+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 30" OR 30" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 29. 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