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actual front end outer dimensions are approximately 27 5/8" width X 20 5/8" height
actual front end outer dimensions are 19
+ Product Details Size – 12"w X 10"h is the size for the duct opening measurement only
Actual Filter Size – 24 3/4"w x 13 3/4" x 1"
+ Product Details Size - 25"w X 34"h is the size for the duct opening measurement only
30" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10in diameter actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 29. 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 from