A selection of products to help with the ventilation of buildings either through the walls, roofs or under floors. Ventilation is the deliberate replacement of air within a building with fresh air from outside. A building requires ventilation to ensure the comfort of people within it and to avoid the build up of moisture and air pollutants. If there is inadequate ventilation the air quality can be poor, damp can be a problem and it may be hard to regulate the building's temperature.
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