9 Computer systems, hardware and software; computer programs, downloadable; computer software in the form of web applications and web servers; computer software in the form of apps for mobile devices; computer programs for regulating and monitoring activity in a filter unit; sensors; sensors for collecting and measuring of technical data; sensors for collecting and measuring of temperature, air pollution, humidity, sound and light; monitoring sensors and alarms; internet of things (IoT) sensors; internet of things (IoT) gateways; all the aforesaid goods, only in relation to the following fields: aerosol and gas filtration in air-handling systems and workplace environments