8" x 10" or 10" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 12.5"] 6" Diameter Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 29 3/4" x 1"

Whether installed on a sidewall or ceiling

actual front end outer dimensions are approximately 26 5/8" width X 34 5/8" height

This versatile diffuser is available in 1-way

actual front end outer dimensions are approximately 36 5/8" width X 16 5/8" height

8" x 10" or 10" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 12.5"] 6" Diameter Actual Filter Size – 33+ Product Details Perfect Fit & Easy Sizing Designed for a 8" x 10" or 10" x 8" duct opening (measured at the opening), with actual outer dimensions of 10. 5" W x 12. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 7. 75" x 9. 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