16" x 25" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w16h16 + Product Details Size -

+ Product Details Size - 26"w X 22"h is the size for the duct opening measurement only

+ Product Details Size - 18"w X 28"h is the size for the duct opening measurement only

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+ Product Details Size - 32"w X 25"h is the size for the duct opening measurement only

The 1/2" black insulation

16" x 25" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w16h16 + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 25" OR 25" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 27. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 24. 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