Titan 2000 Hydroxyl Generator is a true commercial hydroxyl machine. Hydroxyl radicals are highly reactive oxidizing molecules. A hydroxyl radical is produced by (UVA) light in the 365nm-385nm spectrum reflecting off a titanium dioxide (TIO2) catalyst. When humidity (H20) comes in contact with the photocatalytic process a hydroxyl radical (OH) is formed. The hydroxyl radical (OH) is then dispersed into the contaminated area by a high velocity fan decomposing organic as well as inorganic pathogens into carbon dioxide and water. Their is always humidity in the air so this equipment is always working.