12" x 30" or 30" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 8in Suitable for all AC applications

Suitable for all AC applications

actual front end outer dimensions are approximately 10 5/8" width X 28 5/8" height

+ How To Measure A Grille Overall Size:

+ Product Details Size – 18"w X 28"h is the size for the duct opening measurement only

12" x 30" or 30" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 8in Suitable for all AC applications+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 30" or 30" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 29. 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