8" x 30" or 30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 32.5"] 6" Round Duct Pipe Actual Filter Size – 11

Actual Filter Size – 11 3/4"w x 27 3/4" x 1"

durable plastic

Adjustable airflow control – Adjustable airflow control: The system allows users to customize the amount of air supply

+ Product Details Size - 12"w X 8"h is the size for the duct opening measurement only

+ Product Details Size – 16" x 18" or 18" x 16" is the size for the duct opening measurement only

8" x 30" or 30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 32.5"] 6" Round Duct Pipe Actual Filter Size – 11+ Product Details Perfect Fit & Easy Sizing Designed for a 8" x 30" or 30" x 8" duct opening (measured at the opening), with actual outer dimensions of 10. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 7. 75" x 29. 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