18" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RV Mobile Home Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 8" duct openings

actual front end outer dimensions are approximately 12 5/8" width X 12 5/8" height -

75" Width X 25

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+ Product Details Size – 6" x 18" or 18" x 6" is the size for the duct opening measurement only

18" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RV Mobile Home Ideal for Walls & Ceilings:+ 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