Ona Carbon-Air System (without gel)The latest in environmentally friendly odor control the ONA Carbon Air combines the best of both worlds carbon filtering with powerful odor neutralization! The ONA Carbon Air unit has two 6 inch ports to facilitate airflow into the carbon filter and out through the fan unit. After the air is filtered, it passes over the ONA which guarantees that all odors have been eliminated. The final result is a clean fresh smell throughout the room. The ONA Carbon