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Note that this is for the "typical" flu virus. But I'm guessing at this stage of the game, a virus is a virus. (Obviously that is not true - the typical flu virus is viable something like 24 hours on a surface. The SARS virus is something like 48 hours. Some reports say Covid-19 is 5 days!) Anyway - the link and some excerpts (I see that I am off a little bit.) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4147198/ "Lindsley et al. [13] found that a 4-μm particle takes 33 min to settle 1 m in still air, and a 1-μm particle takes 8 h; in addition, room air mixing and turbulence can keep these particles airborne even longer.... Experimental studies have demonstrated that the influenza virus can remain infectious in small particle aerosols and can transit across rooms... The aerosol fraction that is <4 μm (the “respirable fraction”) is of particular concern because it can remain airborne for an extended time and disperse throughout a room occupied by a patient with influenza....