28" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Round Duct Pipe Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 21 3/4" x 1"

these airflow control components provide you with effortless control over your indoor environment

This Will Create A Cycle Of In And Out Air FLow

Installation Location – sidewall and ceiling

The smooth

28" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Round Duct Pipe Actual Filter Size – 33+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 10" OR 10" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 12. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 9. 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