There are more split air-conditioning systems being used at home and at work. Opening windows to ventilate homes is common . However, when come to workspace, opening of windows to ventilate the space can be rarely carried out for workspace installed with split air-conditioning systems.
This latest guide jointly from BCA,NEA and MOH recommended among others,
increasing ventilation and enhance air exchange in another effort for safe environment against COVID-19 :
a. Open operable windows and doors as frequently as possible, unless outdoor air quality is poor. Air-conditioning should be reduced or turned off when doors and/or windows are opened.
b. Consider adding dedicated outdoor air supply and/exhaust.
c. Operate exhaust fans (e.g. toilet, kitchen) at full capacity to expel air form the indoor space. Keep windows or other openings (e.g. back door) around exhaust fans closed to avoid short-circuiting of air flow.