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actual front end outer dimensions are approximately 12 5/8" width X 12 5/8" height
+ Product Details Outer dimensions: 17
featuring a sleek ½” fin design
+ Product Details Size – 24"w X 16"h is the size for the duct opening measurement only
actual front end outer dimensions are approximately 18 5/8" width X 34 5/8" height
18" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Round Duct Pipe actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 34" OR 34" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 33. 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
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