36" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 12" X 8" duct openings

High Quality Aluminum – The premium durable aluminum will never rust and it will never wear through leaving the material with an elegant

Actual Filter Size – 24 3/4"w x 27 3/4" x 1"

actual front end outer dimensions are approximately 32 5/8" width X 20 5/8" height

36" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil Ideal for Walls & Ceilings:+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 6" OR 6" x 36" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 5. 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