Final answer:
In wind-assisted natural horizontal ventilation, windows and doors should be opened on the windward side.
Step-by-step explanation:
In wind-assisted natural horizontal ventilation, windows and doors should be opened on the windward side. This means that they should be opened on the side of the building that is facing the direction from which the wind is blowing. By opening the windows and doors on the windward side, the wind can enter the building and create a flow of air, helping to ventilate the space.