12" x 34" or 34" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coated 75" Deep - Will Fit

75" Deep - Will Fit All Garrage Doors - Insulated And Non Insulated Garrage Doors [The Hole In The Door SHould Be: 15 ¼ x 9 ¾]

unrestricted airflow with a precise 50° angled design

+ Product Details Size – 24"w X 14"h is the size for the duct opening measurement only

+ Product Details Size – 18" x 20" or 20" x 18" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 20 5/8" width X 8 5/8" height

12" x 34" or 34" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coated 75" Deep - Will Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 34" or 34" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 33. 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