6" x 36" or 36" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 38.5"] white Actual Filter Size – 24

Actual Filter Size – 24 3/4"w x 29 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 28" OR 28" x 18" duct opening (measured at the opening)

actual front end outer dimensions are approximately 18 5/8" width X 10 5/8" height

+ Product Details Size – 24" x 34" or 34" x 24" is the size for the duct opening measurement only

Powder-Coat Finish – smooth

6" x 36" or 36" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 38.5"] white Actual Filter Size – 24+ Product Details Perfect Fit & Easy Sizing Designed for a 6" x 36" or 36" x 6" duct opening (measured at the opening), with actual outer dimensions of 8. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 5. 75" x 35. 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