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actual front end outer dimensions are approximately 42 5/8" width X 12 5/8" height -
+ Product Details Size – 12"w X 12"h is the size for the duct opening measurement only
Actual Filter Size – 17 3/4"w x 23 3/4" x 1"
If your duct opening is 14 inches in diameter
actual front end outer dimensions are approximately 52 5/8" width X 22 5/8" height -
26" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18in diameter actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 28" OR 28" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 27. 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