18" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coated Actual Filter Size – 27

Actual Filter Size – 27 3/4"w x 19 3/4" x 1"

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

+ Product Details Size – 20"w X 32"h is the size for the duct opening measurement only

18" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coated Actual Filter Size – 27+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 36" OR 36" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 35. 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