Development, construction, assembly of ventilation devices (central and decentralized). Also large equipment for fitness studios, offices, sales rooms, social rooms etc... 2 ventilation units 100m³ up to 95% living room ventilation ventilation units Twin-Fresh R50 Heat recovery 300m³ up to 85-95% WRG ventilation heat exchanger apartment ventilation Ventilation device 1000m³ up to 88% WRG ventilation ventilation system 500m² VUT 1000 H Ventilation device 1000m³ up to 90% recovery WRG KWL central living room ventilation Ventilation device 300m³ up to 85-95% WRG ventilation bypass living room ventilation VUT 300 H EC Apartment ventilation 26Watt 0-160m³ up to 95% silent living room ventilation ventilation system 2 ventilation units 100m³ up to 95% living room ventilation ventilation units Tw.