22" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Diameter Actual Filter Size – 31

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

actual front end outer dimensions are approximately 27 5/8" width X 34 5/8" height

75"H – fits a 18" X 4" duct opening

+ Product Details Size - 24"w X 4"h is the size for the duct opening measurement only

22" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Diameter Actual Filter Size – 31+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 12" OR 12" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 11. 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