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Efficient Airflow Design: The slots are meticulously angled to diversify airflow in two directions
+ Product Details Size – 10"w X 10"h is the size for the duct opening measurement only
actual front end outer dimensions are approximately 20 5/8" width X 38 5/8" height -
+ Product Details Outer dimensions: – fits a duct opening
+ Product Spec Sheet Aluminum Return Filter Grille Spec Sheet
18" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10" Diameter Efficient Airflow Design: The slots+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 32" OR 32" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 34. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 31. 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