18" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Anodized Aluminum Actual Filter Size – 29

Actual Filter Size – 29 3/4"w x 23 3/4" x 1"

actual front end outer dimensions are approximately 28 5/8" width X 22 5/8" height

+ Product Details Size – 16" x 24" or 24" x 16" is the size for the duct opening measurement only

Universal size

18" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Anodized Aluminum Actual Filter Size – 29+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 10" OR 10" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 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