28" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 8" or 8" x 12" duct opening (measured at the opening)

+ Product Details Size - 22"w X 10"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 22 5/8" width X 10 5/8" height

box or other attachments needed

28" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 10" OR 10" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 12. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 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