36" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter } function toggleAccordion(event) { event

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 20" OR 20" X 14" duct opening (measured at the opening)

9% Pure Copper meeting ASTM B280 standards

+ Product Details Size – 20"w X 18"h is the size for the duct opening measurement only

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