14" x 36" or 36" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Curved Blade Steel + Product Details Size -

+ Product Details Size - 28"w X 12"h is the size for the duct opening measurement only

This aluminum adjustable louvered garage vent allows air ventilation and circulation in your garage 24 hours a day

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Tailored for Your Needs: Specifically suited for 24x24 lay-in diffusers

14" x 36" or 36" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Curved Blade Steel + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 36" OR 36" X 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 75" x 35. 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