english: According to the research, in European families ventilation system popularizing rate is more than 96.56%, In UK, Japan and America, gross value of ventilation system production even occupy more than 2.7% of the GDP value.
non_english: Miturut riset, ing kulawargané Eropah sistem ventilasi tingkat populèr luwih saka 96,56%, Ing UK, Jepang lan Amerika, Nilai reged produksi sistem ventilasi malah Occupy luwih saka 2.7% saka cahya GDP.