6" x 34" or 34" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 36.5"] Round Damper Ring actual front end outer dimensions

actual front end outer dimensions are approximately 20 5/8" width X 16 5/8" height

Constructed from sturdy 20-gauge steel

+ Product Details Size – 18"w X 30"h is the size for the duct opening measurement only

Design – Equipped with lever for full airflow control

actual front end outer dimensions are approximately 10 5/8" width X 18 5/8" height

6" x 34" or 34" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 36.5"] Round Damper Ring actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 6" x 34" or 34" x 6" duct opening (measured at the opening), with actual outer dimensions of 8. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 5. 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