In natural ventilation, which method helps in achieving fresh air circulation?

The method of strategically opening windows and doors is fundamental to achieving fresh air circulation in natural ventilation. This approach relies on the natural forces of wind and thermal buoyancy, allowing outdoor air to flow into the indoor space while expelling stale air. By optimizing the positioning of openings, you can enhance cross-ventilation, which is the movement of air through a space due to pressure differences. This method is especially effective in climates where outdoor air quality is suitable for mixing with indoor air.

Utilizing air conditioning primarily recirculates indoor air and may not introduce fresh air from outside, thus not supporting natural ventilation. Mechanical filters are designed to clean indoor air but do not facilitate the exchange of indoor and outdoor air. Heating the indoor air can affect air movement within a space but does not inherently introduce fresh air or support the principles of natural ventilation. Hence, the strategic opening of windows and doors stands out as the most effective method for promoting direct airflow and ensuring a supply of fresh air.