12" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 14.5" X 14.5"] Insulated Line + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 30" OR 30" x 20" duct opening (measured at the opening)

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

+ Product Details Size - 18"w X 14"h is the size for the duct opening measurement only

this HVAC vent duct cover ensures durability and reliability

actual front end outer dimensions are approximately 22 5/8" width X 8 5/8" height

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