16" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line Set Durable Construction – Made from

Durable Construction – Made from high-quality

The first number in a grille size represents the width

+ Product Details Size – 25"w X 30"h is the size for the duct opening measurement only

our Circular Air Supply Valves are ideal for low and medium pressure ventilation air conditioning systems

actual front end outer dimensions are approximately 28 5/8" width X 8 5/8" height

16" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line Set Durable Construction – Made from+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 12" OR 12" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 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