I work in this field (infection control) and see a lot of products being pushed, especially lately. One we actually installed in our hospital is a replacement

I work in this field (infection control) and see a lot of products being pushed, especially lately. One we actually installed in our hospital is a replacement for the regular fluorescent lights you see in every building. It's a direct swap out so pretty easy for any maintenance crew to complete. Instead of directing the UV light into the room, it simply has a duct inside with a fan that directs air to pass by powerful UV lights. The UV light is contained to a small box within the unit and the people around never are exposed. The only drawback is the fan noise, but in hospitals, the background sound is already pretty high. I believe you can schedule the fan to stop overnight. Otherwise it basically continuously circulates the air in the room, always passing over a UV source to kill pathogens that might be in the air. EDIT - just to clarify, you swap out the whole box, not just the bulb. Like this (http://2.bp.blogspot.com/-etoHnNVcOnw/Tu0xY9sDwCI/AAAAAAAAA3s/eBAdYcoFnAE/s1600/IMG_0592.JPG http://2.bp.blogspot.com/-etoHnNVcOnw/Tu0xY9sDwCI/AAAAAAAAA3...) but usually in a drop ceiling.