28" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 8in Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 15 3/4" x 1"

Design – 180 degrees double direction adjustable - fins are manually adjustable individually for optimal air distribution

+ Product Description Introducing the 6" Butterfly Damper – Your Solution for Controlled Airflow

Close For Winter To Prevent The Cold

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 8" OR 8" x 30" duct opening (measured at the opening)

28" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 8in Actual Filter Size – 33+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 8" OR 8" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 5. 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