英語翻譯
unprotected personnel must vacate the working area
general exhaust is adequate under normal operating conditions if risk of overexposure exists wear SAA approved respirator correct fit is essential to obtain adequate protection provide adequate ventilation in warehouse or closed storage areas.air contaminants generated in the workplace possess varying "escape" velocities which in turn determine the "capture velocities" of fresh circulating air required to effectively remove the contaminant.