"Industrial fans – De " CNS Standards Search Result

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	CNS 7779-4 - English Version Industrial fans – Determination of fan sound power levels under standardized laboratory conditions – Part 4: Sound intensity method 工業用風機－在標準化實驗室條件下風機聲功率位準測定－第4部：聲強度法 - 英文版
	CNS 7779-3 - English Version Industrial fans – Determination of fan sound power levels under standardized laboratory conditions − Part 3: Enveloping surface methods 工業用風機－在標準化實驗室條件下風機聲功率位準測定－第3 部：包絡面法 - 英文版

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