30" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter white These are built heavy duty

These are built heavy duty for installation into brick and cement walls

Removable core for access to optional damper

Ideal for Walls & Ceilings: Designed for seamless installation in standard 12" X 10" duct openings

including the ability to mount without removing the thermostat when using the ring base

Crafted from solid stamped steel

30" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter white These are built heavy duty+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 26" OR 26" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 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