18" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coat actual front end outer dimensions

actual front end outer dimensions are approximately 52 5/8" width X 22 5/8" height -

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Operating from -40°F to +248°F

+ Product Details Size - 26"w X 16"h is the size for the duct opening measurement only

18" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coat actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 14" OR 14" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 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