26" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w12h12 + Product Details Size –

+ Product Details Size – 24"w X 36"h is the size for the duct opening measurement only

4" X 12" Brass Victorian Floor Register Grille - Modern Contempo Decorative Grate - HVAC Vent Duct Cover - Brass Plated

+ Product Details Size – 12"w X 10"h is the size for the duct opening measurement only

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26" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w12h12 + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 25. 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 Made from