34" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line + Product Details Size –

+ Product Details Size – 28"w X 10"h is the size for the duct opening measurement only

Actual Filter Size – 31 3/4"w x 23 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 10" or 10" x 12" duct opening (measured at the opening)

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34" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 32" Or 32" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 34. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 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