Mobile on castors. Functional compact ventilation system with original industrial components. Representation of instrumental characteristic curves of ventilator, heater, filter, etc.. Extendable duct system. Fixing facilities for the concerned components, filter, heat exchanger with hot water service, ventilator with continuously adjustable speed and additional butterfly valve, sound absorber, flange for mounting components, fire protection butterfly valve, Aluminium flex pipe, 2 top venting valve.