30" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w6h6 Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 12" X 4" duct openings

Weather and Pest Proof – These louvers are especially designed to prevent water from entering your home

+ Product Details Size - 34"w X 10"h is the size for the duct opening measurement only

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30" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w6h6 Ideal for Walls & Ceilings:+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 28" OR 28" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 27. 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