8" x 12" or 12" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 14.5"] Material_Aluminum it effectively prevents unauthorized access

it effectively prevents unauthorized access

Actual Filter Size – 21 3/4"w x 23 3/4" x 1"

+ Product Details Size - 34"w X 24"h is the size for the duct opening measurement only

at predicted low air motion 35 fpm in the zone of occupancy

The lightweight yet rigid construction ensures durability without sacrificing ease of handling

8" x 12" or 12" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 14.5"] Material_Aluminum it effectively prevents unauthorized access+ Product Details Perfect Fit & Easy Sizing Designed for a 8" x 12" or 12" x 8" duct opening (measured at the opening), with actual outer dimensions of 10. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 7. 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