... the ventilator is capable of blowing air, ocean air containing salt vapour, and corrosive air containing a small quantity of oil ... 50HZ or 440V,60HZ.COMPANY INTRODUCTION Our company,Qingdao Chunhao Air Blower Ventilation Equipment Co., Ltd. is located in the ... and manufacturing whole sets of aeration systems for air exchange, dust cleaning and air power transportation. Holding the tenet of "credibility ...