36" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 box-shadow: 0 2px 4px rgba(0

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Do not measure the overall size of the register itself

75" Width X 25

+ Product Details Size – 30"w X 20"h is the size for the duct opening measurement only

36" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 box-shadow: 0 2px 4px rgba(0+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 35. 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