You can never have too much protection when it comes to your health and safety.  UVC energy deactivates viruses and destroys bacteria as the air passes over the lamps. But what about air that hasn’t made it into the UVC chamber yet? The positive and negative charged ions floating in the room air and landing on surfaces also destroys and deactivates them. Think of it as a pretreatment to reduce pathogen levels while the air hasn’t yet reached the UVC chamber.