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actual front end outer dimensions are approximately 20 5/8" width X 18 5/8" height
+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 12" OR 12" x 20" duct opening (measured at the opening)
+ Product Details Size - 4"w X 18"h is the size for the duct opening measurement only
Actual Filter Size – 23 3/4"w x 29 3/4" x 1"
30" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grilles actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 6" OR 6" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 5. 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 Made
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