occurs when the air in a space is changed with outdoor air without the use mechanical systems, such as a fan

• Natural Ventilation

• Mechanical Ventilation

• Stack effect ventilation

• Wind effect ventilation

When air flow is due to wind, air enters through openings in the windward walls, and leaves through openings in the leeward walls

• Wind driven ventilation

• Stack effect or ventilation

• Combination of both wind and stack effects

• Natural ventilation

When air movement is due to temperature difference between the indoor and outdoor, the flow of air is in the vertical direction and is along the path of least resistance.

• Wind driven ventilation

• Stack effect or ventilation

• Combination of both wind and stack effects

• Natural ventilation

a combined force of wind and stack effects

• Wind driven ventilation

• Stack effect or ventilation

• Combination of both wind and stack effects

• Natural ventilation

system slightly pressurizes the house by drawing outdoor air into the house

• Exhaust System

• Supply System

• Balanced System

• mechanical ventilation systems

The importance of mechanical ventilation except:

• To remove heat and dirty air

• To control ventilation systems

• To get enough air – quality and quantity

• To give hot air into building

Definition of Ventilation

• Supply of fresh air to the conditioned space either

  by natural or by mechanical means for the purpose

  of maintaining acceptable indoor air quality

• Supply of fresh air to the conditioned space either

  by natural or by mechanical means for the purpose

  of maintaining acceptable outdoor air quality

• Supply of fresh air to the conditioned space only

  by natural means for the purpose

  of maintaining acceptable indoor air quality

• Supply of fresh air to the conditioned space by mechanical means for the purpose

  of maintaining acceptable outdoor air quality

THE NECESSITY OF VENTILATION IN BUILDING (more than 1 answer)

• To provide fresh air for the occupants to breath

• To remove stale air which may be contaminated with moisture or smoke particles

• To remove or dilute odours

• For heating of the buildings,the occupants or both

Give 1 of the two types of ventilation ?

What is the main purpose of ventilation?

• To promote the cooling of a building

• To promote the heating of a building

• To maintain a certain level of humidity in a building

• To promote the circulation of air, especially in an enclosed space