28" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RV Mobile Home With precise measurements and easy

With precise measurements and easy installation

with actual outer dimensions of 18

the actual front end outer dimensions are 10" in diameter

4" X 10" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

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28" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RV Mobile Home With precise measurements and easy+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 30. 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