male operator worker walkie talkie using laptop checking quality cooling air piping hvac system at industrial building. man

pipe system industrial pipeline factory compressor steel heat air conditioning hvac cooler conditioner temperature machine pump building equipment engineering control technology construction industry cooling maintenance power metal ventilation energy person service technician installation refrigeration tube cold plant roof pressure infrastructure man electric structure modern mechanical worker rooftop boiler business tablet male operator walkie talkie laptop checking quality piping building engineer working heating