Ventilation is important to maintain the air quality and to control moisture levels in a property.
High levels of moisture not only cause damage to the fabric of a building but are also the breeding ground for mold, mildew and dust mites. These organisms thrive in cold damp houses and are the reason we have one of the highest rates of asthma (and other respiratory illnesses) in the world.
In addition, health can be affected by poor indoor air quality due to all the chemicals we add when using every day household products such as cleaning, disinfecting, and cosmetic supplies.
A ventilation system will:
- Reduce condensation and weeping windows
- Reduce mildew and mold spores
- Provide a dry home which requires much less energy to heat
- Reduce security risks associated with open windows and doors
- Remove dust, pollen and other allergens from the air
- Deliver fresher, drier, healthier air into your home
- Expel airborne pollutants
There are 2 main types of ventilation systems:
- Positive pressure ventilation systems
- Energy recovery ventilation systems
Positive pressure ventilation systems
The positive pressure system blows drier air from the roof cavity through single or multiple ceiling vents. This pushes the stale damp air outside through gaps at windows or doors.
Examples of this type of system would be Envirovent, Drivaire, HRV and DVS
Energy recovery ventilation systems (ERV)
The energy recovery (balanced pressure) system works with two fans and two different air streams. One fan draws fresh air from outside into the house, while the other extracts warm, stale air from inside the house and transfers some of it's heat energy to the incoming air in a heat exchanger unit.