30" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Black please note that the total

please note that the total outer dimensions of the grille measure 8" in diameter

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 22" Or 22" x 34" duct opening (measured at the opening)

+ Product Details Size – 18"w X 26"h is the size for the duct opening measurement only

Noise free components - no vibrating louvers etc

30" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Black please note that the total+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 22" OR 22" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 21. 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