16" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Supply Grille + Product Details Size –

+ Product Details Size – 16"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 16"w X 32"h is the size for the duct opening measurement only

+ Product Details Size - 18"w X 30"h is the size for the duct opening measurement only

Slim Sliding Metal Damper To Control and Adjust Airflow

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16" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Supply Grille + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 8" OR 8" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 7. 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