36" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum Use the wire color coding

Use the wire color coding provided: L (Live): Brown

14"w X 4"h Is The Size For The Duct Opening Measurement Only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 24" X 6" duct openings

actual front end outer dimensions are approximately 14 5/8" width X 30 5/8" height

Installation is hassle-free

36" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum Use the wire color coding+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 8" OR 8" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 7. 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