30" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in Ideal for Walls & Ceilings:

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

Design – Individually adjusting curved blades for better air flow control

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Actual Filter Size – 33 3/4"w x 11 3/4" x 1"

+ Product Details Size – 30" x 32" or 32" x 30" is the size for the duct opening measurement only

30" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in Ideal for Walls & Ceilings:+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 34" OR 34" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 33. 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