How does Background Ventilation Work?
Background ventilation uses the principle of pressure equalisation, where wind flow around a building creates a higher air pressure on the windy side and lower air pressure on the sheltered side. Due to this difference in air pressure, fresh air is pulled into the building on the windward side and stale air is expelled to the sheltered side. This ventilation requires no power source or fans.
How to control condensation
Condensation occurs when water vapour in the air is cooled to it’s dew point. This commonly occurs when the water vapour in the air comes into contact with a cold surface such as glass windows.
Excessive condensation can cause mildew to appear on curtains and furnishings and walls causing costly damage over time.
Condensation can be minimised or eliminated by adhering to the following principles:
- Reduce the amount of moisture being generated in the home.
- Ventilate the building to remove moisture laden air to the outside and replace with drier fresh air.
- Increase the internal temperature during the winter months to a level 5-7 degrees (celsius) higher than outside. It is far easier and cost effective to heat dry air than damp air. Therefore, while it may seem counter-productive to open vents during cold weather, the benefits of proper ventilation often outweighs the mimnimal extra heating required.
- Insulate exterior walls and ceiling to assist in reducing heat loss.
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