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Actual Filter Size – 13 3/4"w x 23 3/4" x 1"
+ Product Details Size – 14"w X 4"h is the size for the duct opening measurement only
actual front end outer dimensions are 19
+ Product Details Size - 10"w X 26"h is the size for the duct opening measurement only
actual front end outer dimensions are approximately 37
18" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Aluminum Actual Filter Size – 13+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 12" OR 12" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 11. 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