18" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RV Mobile Home + Product Details Size –

+ Product Details Size – 12"w X 24"h is the size for the duct opening measurement only

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

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

75"H – fits a 6" X 6" duct opening

18" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RV Mobile Home + Product Details Size –+ 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