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actual front end outer dimensions are approximately 52 5/8" width X 22 5/8" height -
+ Product Details Size - 12"w X 20"h is the size for the duct opening measurement only
Actual Filter Size – 23 3/4"w x 21 3/4" x 1"
Actual Filter Size – 15 3/4"w x 21 3/4" x 1"
+ Product Details Size – 12"w X 32"h is the size for the duct opening measurement only
24" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Diameter actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 18" OR 18" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 17. 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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