A double wall casing with at least a filter, a fan and a temperature controlling component delivering air to the building with minimum 1000m3/h. Only full Air Handling Units may be accounted, not Air Handling Unit sections.
Data collections are organised annually and quarterly (Market Evolution).
Each year, the annual collection involves more than 60 manufacturers. The data is available in value (EUR), with a split by capacity range, expressed in air flow of cubic meters per hour.