it was about • Air handling units (AHU) • Fan coil units (FCU) • Measuring C.f.m and air balancing • Measuring Refrigeration Temperature And Relative Humidity • Cleaning Humidifiers • Installing Motors • Checking And Cleaning VFDS • Lubricate bearings • Working on chembio/hazardous air filtration filters • Installing DX units/air conditioners • Checking problems and perform repairs in various mechanical and electrical equipments in heating, cooling and ventilation system