28" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RV Mobile Home Filter Size - 20

Filter Size - 20

with actual outer dimensions of 18

5" - SEE BELOW IN DESCRIPTION How To Measure A Grille

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28" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RV Mobile Home Filter Size - 20+ 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