12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 12in + Product Details Size -

+ Product Details Size - 30"w X 14"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 24 5/8" width X 27 5/8" height

+ Product Details Size – 30"w X 6"h is the size for the duct opening measurement only

angle the louvers up for efficient cooling

Actual Filter Size – 31 3/4"w x 21 3/4" x 1"

12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 12in + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 26" or 26" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 25. 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