28" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Steel the actual front end outer

the actual front end outer dimensions are 8" in diameter

Noise free components - no vibrating louvers etc

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 6" duct openings

5/8” - 2579 PSI

+ Product Details Size - 34"w X 16"h is the size for the duct opening measurement only

28" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Steel the actual front end outer+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 29. 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