Why is ventilation important?
Ventilation is becoming more important in properties due to the nature of the modern airtight buildings. The older style of building introduced natural ventilation through the gaps and cracks in the building fabric. New homes however do not have this type of natural ventilation, meaning they will require some form of ventilation system.
The main purpose of ventilation is to remove polluted air from the room/building and replace it with fresh air. Moisture is the most significant pollutant. The ‘average’ family of five people produces approximately 6 litres of moisture per day. This moisture is produced by breathing, bathing, cleaning, cooking, drying clothes indoors, perspiration etc. Moisture not only promotes mould but it can also have unseen effects.
The common household dust mite lives in humid environments. The faeces it produces grows fungus upon it where the air is humid. This fungus is prime cause of asthma. Sufficiently high levels of humidity will likely result in mould growth. Other pollutants include carbon monoxide, carbon dioxide, volatile organic compounds, allergens, odours, radon etc.