12" x 16" or 16" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 14.5" X 18.5"] Powder-Coated + Product Details Size –

+ Product Details Size – 18" x 30" or 30" x 18" is the size for the duct opening measurement only

+ Product Details Outer dimensions: 15

75"H – fits a 12" X 12" duct opening

actual front end outer dimensions are approximately 10 5/8" width X 10 5/8" height

+ Product Details Size – 16" x 22" or 22" x 16" is the size for the duct opening measurement only

12" x 16" or 16" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 14.5" X 18.5"] Powder-Coated + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 16" or 16" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 15. 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