12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil-Insulated Line Set Actual Filter Size – 17

Actual Filter Size – 17 3/4"w x 7 3/4" x 1"

Ideal for Walls & Ceilings: Designed for seamless installation in standard 24" X 10" duct openings

actual front end outer dimensions are approximately 20 5/8" width X 22 5/8" height

Key Features:

12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil-Insulated Line Set Actual Filter Size – 17+ 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