34" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter with filter + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 22" or 22" x 6" duct opening (measured at the opening)

+ Product Details Size - 12"w X 20"h is the size for the duct opening measurement only

5" - SEE BELOW IN DESCRIPTION HOW TO MEASURE A GRILLE

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 10" duct openings

34" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter with filter + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 33. 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 Made from