Ozz there are companies which specialize in building these types of systems. Some strains are more resistant than others. Dwell time is very important in removal of many types of contaminats from an airstream. The linear velocity can be slowed down with a transition in duct size and filter bank size or dwell time can be increased by the length of the plenum where the Uv light is placed so that the contaminant is being exposed to the UV for a longer period of time. I have spent the last 21 years working with hospitals, food products manufacturers and others who need very high quality treated air to be delievered by their conditioned air. Often times I have been required to work with HVAC contractors to help them meet the customers needs as they didn't understand some of these things.
Dave Nowlin
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