14" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 12" duct openings

+ Product Details Size - 26"w X 30"h is the size for the duct opening measurement only

+ Product Details Outer dimensions: 21

+ Product Details Size – 26" x 28" or 28" x 26" is the size for the duct opening measurement only

14" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum Ideal for Walls & Ceilings:+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 6" or 6" x 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 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 Made