Which of the following is TRUE about cross-ventilation?

Question

BlackTom AI · Accepted Answer

Question focus: cross-ventilation and how it creates airflow without mechanical systems.
Option 1: 'Air enters and exits through the same opening.' This setup tends to produce limited or inefficient ventilation because the air has nowhere to flow through the space from one side to the other; cross-ventilation relies on two or more openings so air can traverse the interior. Therefore, this statement is not accurate for true cross-ventilation.
Option 2: 'Air inlets on the same sides of the building allow fresh air to flow through.' When inlets are on the same side, the pressure differences inside the building do not drive a through-flow from one side to another, so there is minimal cross-current. This describes a single-sided ventilation pattern rather than true cross-ventilation.
Option 3: 'It leverages wind pressure differences to create airflow without requiring mechanical systems.' This aligns with the fundamental idea of cross-ventilation: outdoor wind creates pressure differences across openings on opposite sides, driving air through the interior naturally without fans or ducts. It captures the key mechanism and the reliance on external wind forces.
Option 4: 'Air recirculates within a closed space.' Recirculation within a single enclosed volume does not constitute cross-ventilation, which is specifically about exchanging indoor air with outdoor air via openings. Hence, this option describes stagnation or internal mixing, not cross-ventilation.

ABPL20033_2025_SM2 Quiz Week 7

Which of the following is TRUE about cross-ventilation?

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