26" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum - Cube Core The integral multi-shutter damper with

The integral multi-shutter damper with a convenient handle operator ensures that you can easily adjust the air volume

offering maximum flexibility

Adjust the airflow to your preference by simply opening or closing the top panel

Adjustable airflow control - by rotating the middle disk

14"w X 8"h Is The Size For The Duct Opening Measurement Only

26" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum - Cube Core The integral multi-shutter damper with+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 28" OR 28" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 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