28" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter actual front end outer dimensions

actual front end outer dimensions are 19" Width X 11" Height

Designed for both wall and ceiling applications

+ Product Description Introducing the 6" Butterfly Damper – Your Solution for Controlled Airflow

+ Product Details Outer dimensions: 15

+ Product Details Size - 12"w X 18"h X 2"d (for duct opening measurement only)

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