In extreme cases, vapors may accumulate in dwellings or occupied buildings to levels that may pose near-term safety hazards (e.g. explosion) or acute health effects. This occurs when there is a migration of chemical-containing vapor from a subsurface source into an overlying building. Fortunately, mitigation and barrier systems can help.
The long-term performance of any exterior building enclosure assembly is directly related to the level of planning implemented during the initial phases of the design process. It requires the combined efforts of the owner, building enclosure commissioning provider (BECxP), design team, and contractors.
Natural ventilation has typically been the means of providing fresh air for occupants. Operable windows and doors allow occupants to control the amount of air that enters and leaves a building, or individual spaces.
Until now, design professionals have had to rely on adding off-the-shelf actuators to standard windows to provide automated natural ventilation in a building. With this as the only available solution, there have been several problems.