6" x 8" or 8" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 10.5"] Compatible With Duct 10in Actual Filter Size – 27

Actual Filter Size – 27 3/4"w x 17 3/4" x 1"

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

+ Product Description Enhance your HVAC system with our premium Aluminum Double Deflection Adjustable Air Supply Diffuser

+ Product Details Size – 24" x 26" or 26" x 24" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 24 5/8" width X 18 5/8" height

6" x 8" or 8" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 10.5"] Compatible With Duct 10in Actual Filter Size – 27+ Product Details Perfect Fit & Easy Sizing Designed for a 6" x 8" or 8" x 6" duct opening (measured at the opening), with actual outer dimensions of 8. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 5. 75" x 7. 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