18" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w30h30 + Product Details Size –

+ Product Details Size – 34"w X 28"h is the size for the duct opening measurement only

+ Product Details Size – 34"w X 20"h is the size for the duct opening measurement only

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Actual Filter Size – 13 3/4"w x 23 3/4" x 1"

18" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w30h30 + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 14" OR 14" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 13. 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