24" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil-Insulated Line Set Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 11 3/4" x 1"

+ Product Details Size - 36"w X 14"h is the size for the duct opening measurement only

actual front end outer dimensions are 26

+ Product Details Size - 12"w X 16"h is the size for the duct opening measurement only

Mounted with frame and bayonet joint which are included

24" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil-Insulated Line Set Actual Filter Size – 21+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 16" OR 16" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 15. 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