34" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return + Product Description Introducing the

+ Product Description Introducing the 8" Radial Damper – Your Solution for Controlled Airflow

+ Product Details Size – 18" x 28" or 28" x 18" is the size for the duct opening measurement only

Center Core is Removable for Easy Access and Maintence

+ Product Details Size – 22"w X 36"h is the size for the duct opening measurement only

Actual Filter Size – 31 3/4"w x 15 3/4" x 1"

34" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return + Product Description Introducing the+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 18" Or 18" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 17. 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