18" x 28" or 28" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder Coated [Outer Dimensions: 12

[Outer Dimensions: 12

+ Product Details Size - 16"w X 16"h is the size for the duct opening measurement only

Polished Pre-Finish Gloss Varnish Ready To Install - Can Also Be Sanded And Re-finished According To Application Needs

+ Product Details Size - 32"w X 18"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 22 5/8" width X 14 5/8" height -

18" x 28" or 28" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder Coated [Outer Dimensions: 12+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 28" OR 28" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 27. 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