Ventilation units for fan coil or ducted air handling systems, for usage in HVAC. Design based on specific customer requirements. Air flow tests, noise tests, and ERP compliance checks in the EMI laboratory. Solutions with multi-speed AC motor or with EC motor combined with inverter for a better energy efficiency. Available variants from 1 to 3 centrifugal fans with diameters from 108 to 240 mm, in aluminum or plastic.