Abstract: The effect of global warming was analysed and determined widely worldwide. According to the greenhouse gases (GHGs) inventory standard of ISO 14064-1:2018, six categories of GHGs emission were assessed and calculate the amount of emission globally. Plenty of techniques including a combustion technical development and a ventilation technical development were employed to evaluate and to solve the effect of global warming. This study was applied to design and calculate the model of ventilation system that can reduce the parameter involving the pressure loss (PR) and increase the suction velocity (Vs) in a duct of local ventilation system and can reduce the energy use. In view of energy and power saving and the effect of global warming reduction, a combustion technical development and a ventilation technical development were necessary.