30" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 + Product Details Size –

+ Product Details Size – 28"w X 36"h is the size for the duct opening measurement only

+ Product Details Size – 10" x 12" or 12" x 10" is the size for the duct opening measurement only

+ Product Details Size – 16" x 26" or 26" x 16" is the size for the duct opening measurement only

actual front end outer dimensions are 17

+ Product Details Size - 18"w X 30"h is the size for the duct opening measurement only

30" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter rg1010 + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 14" OR 14" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 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