24" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel + Product Details Size -

+ Product Details Size - 24"w X 18"h is the size for the duct opening measurement only

Actual Filter Size – 27 3/4"w x 9 3/4" x 1"

Easy Unrestricted Air Flow For Your HVAC System

actual front end outer dimensions are approximately 23 5/8" width X 7 5/8" height

24" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 8" OR 8" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 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