34" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line display = isOpen

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+ Product Details Size – 20"w X 6"h is the size for the duct opening measurement only

75" width X 27

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 20" OR 20" x 18" duct opening (measured at the opening)

+ Product Details Size – 25"w X 22"h is the size for the duct opening measurement only

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