36" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil with actual front end outer

with actual front end outer dimensions of 6"

+ Product Details Size - 24"w X 12"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 26"h is the size for the duct opening measurement only

+ Product Details Size – 24" x 24" with 12" collar T-Bar drop ceiling perforated return grill - metal back casing

36" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil with actual front end outer+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 14" OR 14" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 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