Since the question of how long should a ventilation blower be operated has been brought up, it’s important to know that there are some variables. For example, if you have a commercial building with an HVAC system installed, then it will need to run for at least 8 hours per day.
However, if your building is not so large or does not have air conditioning installed in it, then the blower can be turned off at night when the temperature falls below 75 degrees Fahrenheit and turned on again in the morning when temperatures rise above this threshold.
There are also other variables that need to be considered, like the temperature inside and outside of your building. For example, if it is very hot out then you might want to turn off the ventilation blower when temperatures fall below 75 degrees Fahrenheit at night. Likewise, if it’s cold out (below 45 degrees Fahrenheit) then you should turn on the ventilation blower during these hours because this will maintain a constant airflow in order to keep all areas warm or cool enough depending on what they require.
Lastly, humidity levels must be taken into account as well since high humidity can cause condensation which would make for an uncomfortable environment indoors. In fact, high humidity can lead to mold growth which can pose serious health risks for both occupants.