Knop Investments takes majority stake in Vostermans Ventilation

Knop Investments acquired Vostermans Ventilation in October 2026. The perimeter covered the ventilation business, one of the two companies forming Vostermans Companies alongside Vostermans Alu Foundries, which produces aluminium castings for industrial applications. Vostermans Ventilation develops, manufactures and sells axial fans, the type in which the blades push air along the axis of the shaft rather than turning it outwards. Its main market is agriculture, where fans move air continuously through livestock buildings and greenhouses: cattle, pigs and poultry housed indoors produce heat, moisture and ammonia, and without constant circulation the animals fall ill and growth suffers. The second market is industrial, where the same fans cool machinery and ventilate workshops. Those conditions explain the specification. A fan in a livestock shed runs for years in air laden with dust, moisture and corrosive gases, is cleaned with pressure washers between batches, and must keep turning: a failure in summer kills animals within hours. The motors, bearings and housings are built accordingly, and the price follows. Energy consumption has become the second criterion. A barn runs its fans continuously, so the difference between an efficient fan and an ordinary one appears directly in the farm’s electricity bill, and European rules have progressively raised the minimum efficiency a fan must reach to be sold. The company runs its headquarters, production and development in the Netherlands, with assembly and sales operations in Malaysia, the United States and China, serving customers in more than 75 countries.