Honestly, a selling point for apartment buildings with elevators should be having a UV light in there, and in the hallways. Plenty of safe bulbs out there that you can intermix with regular bulbs and hardly notice but be quite effective. I think that should be part of all plans for indoor activities.
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Still, air duct sterilization would also be a good thing and the rating on those types of bulbs is usually 5-8k hours. So about 200 days straight on the lower end of that scale. If it can help save/protect people I feel like that could be a legitimate and worthwhile expense to undertake.
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