Figure 3. An illustration of existing layout of working space and HVAC system in BDV.
Figure 4. An illustrated simulation of adapting the new habit in BDV.
to optimize fresh air. Learning from the air conditioning system in the hospital, the supply outlet
remains to be placed on the ceiling while the return inlet must be modified as close as possible to
the floor. By following the law of gravity, zoning of air in space is divided into two parts, namely
clean air at the top, and dirty air (containing droplets/microdroplets) is at the bottom. The dirty
air collected below is not expected to disperse and can be sucked in directly at the return point
(Fennelly et al. 2004; Wainwright et al. 2009). Of course, changes in the position of the inlet return
must adjust the conditions and placement of walls, columns, and other interior elements.
Regarding the arrangement of the furniture layout, the suggestions are: the working area is to be
placed radially below the suppy outlet ot the clean air (dark blue color) to create a positive pressure
room that can be used by the occupants. The radial arrangement of the working table results in
maintaining a safe distance between users, as mentioned by Nicas and Jones (2009) and Li (2011).
Using a zigzag sitting pattern can minimize the air flow that may contain the virus to the person
behind. This experiment and solution will be more successful if it is implemented together with
new normal habits and other health protocols such as wearing masks, washing hands frequently,
and/or using face shield.
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