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Slowing blowers on a chiller coils allows the air to be colder and remove more moisture. Slow the air flow to minimum necessary to cool the space, reduce fresh air to minimal amount acceptable, and set the chiller temperature as low as possible. These are the easy things. Most consider 20 cfm of fresh air as the minimum for smoking/15 cfm for nonsmoking.
This is consistent with ASHRAE Standard 62-2001 Ventilation for Acceptable Indoor Air Quality, which recommends that the lower boundary of the relative humidity range be limited to 25 percent and the upper boundary of the relative humidity range be limited to 60 percent (Figure 1).