Dwell time plays a critical role in the effective irradiation of pathogens. Larger microorganisms require longer exposure to UVC for them to be successfully irradiated. If the Dwell time inside the equipment it too short, pathogens can remain active and cause potential contamination. Air Sniper equipment has been designed to generate proper dwell time using multiple UVGI chambers inside the stand-alone units and patented air tubulation ramps inside the in-line units. The chambers and tubulation ramps force the pathogens present in the air to pass the UVC bulbs multiple times leaving the air exiting the unit with 99.9% of pathogens irradiated on the first pass.