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1. Natural Ventilation - Guidelines
1. Topography, landscape and surrounding buildings should be
used to direct airflow and maximize exposure to breezes
2. The form of the building has a significant impact on the ability
to ventilate a building by natural means
3. Buildings and ventilating elements should not strictly be
oriented for a particular wind direction (A natural ventilation
system should be effective regardless of wind direction and there
must be adequate ventilation even when the wind does not blow
from the prevailing direction)

Natural Ventilation

2. Natural Ventilation - Guidelines
4. Openings should not be obstructed by buildings, trees,
signboards, or indoor partitions
5. Openings in the vicinity of the neutral pressure level are least
effective for ventilation
6. Architectural elements like wing-walls, parapets and overhangs
may be used to promote air flow into the building
7. For temperature difference (stack effect) to produce air
movement there must be vertical distance between openings;
vertical distance should be as great as possible
Natural Ventilation

3. Natural Ventilation - Guidelines
8. Vertical shafts and open staircases may be used to generate and
increase stack effect
9. Openings with areas much larger than calculated are sometimes
desirable (e.g. hot weather, increased occupancy). The openings
should be accessible and operable by occupants
10. Windows should be located in opposing pressure zones - this
will increase ventilation rate
11.Openings at the same level and near the ceiling should be
avoided since much of the air flow may bypass the occupied
zone

Natural Ventilation

4. Natural Ventilation - Guidelines
12. If inlet and outlet openings are of nearly equal areas, balanced
and greater ventilation can be obtained
13. In hot, humid climates, air velocities should be maximized in
the occupied zones for bodily cooling
14. Openings in the vicinity of the neutral pressure level may be
reduced since they are less effective for thermally induced
ventilation
15. Horizontal window openings are more effective than square or
vertical openings

Natural Ventilation