HVAC installations, namely, clean HVAC installations, CBRN (Chemical, Biological, Radiological, and Nuclear)-safe HVAC installations, anti-CBRN HVAC installations and CBRN-resilient HVAC installations, anti-pollution HVAC installations, anti-dust and anti-air-borne particulate matter HVAC installations; decontamination equipment, namely, fixed or portable sterilizers for the fast decontamination, disinfection or sanitization of air and surfaces; decontamination chambers, namely, clean room in...