Although the Building Code of Australia sets out the minimum ventilation requirement for industrial and commercial premises, this can be less than adequate according to the building use. It is generally recognised that workplace efficiency is improved when ventilation matches the interior conditions. Extracting oppressively hot air and fumes minimises worker lethargy, loss of concentration, and consequent loss of productivity. Even in colder weather, effective air circulation improves the workplace enviroment, so your investment works all year.