28" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 12in Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 8" duct openings

+ Product Details Size - 10"w X 30"h is the size for the duct opening measurement only

Every part is hand inspected for quality before it is packaged

actual front end outer dimensions are approximately 32 5/8" width X 22 5/8" height

28" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 12in Ideal for Walls & Ceilings:+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 14" OR 14" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 13. 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