I didn’t see any ventilation changes (before I was laid off). I’m also not convinced that increasing ventilation would have very much measurable benefit over wearing a mask, washing hands, and regular disinfection of frequently touched surfaces. Think of ventilation in terms of dilution. Turn up the air flow from low to high. Does the increased turnover rate directly correlate to contaminant dilution in the work areas? I don’t think it will. Think of air as water flow. The main flow path gets lots of movement and the bulk of the dilution, but those spaces in cubicles and around furniture are swirling backwaters with minimal dilution. Those cubicles and furniture spaces are where your people are, but unfortunately also the least diluted areas.

Advertise mask wearing, hand washing, and staying/working from home if feeling sick. Spend your money on another janitor to clean the work areas instead of increasing the electric bill by turning up the AC fans.

Another point on increasing ventilation is that it could be counter productive. Depending on your AC/ventilation system, increased AC flow may also dry out your office air (and sweaters may become more popular). That could dry out workers mucous membranes and dry out nasal passages, possibly leading to increased susceptibility to colds, etc.