30" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w16h16 + Product Details Size -

+ Product Details Size - 28"w X 20"h is the size for the duct opening measurement only

+ Product Description Introducing HVAC Premium's Aluminum Adjustable Return Grill – the key to enhanced air control and energy efficiency

Can be hooked up with our Butterfly Dampersfor precise airflow control

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 22" OR 22" X 16" duct opening (measured at the opening)

Constructed from sturdy 20-gauge steel

30" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w16h16 + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 12" OR 12" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 11. 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