The so-called negative pressure ward means that under the special device, the air pressure in the ward is lower than the air pressure outside the ward. In this case, in terms of air circulation, only the fresh air outside can flow into the ward, and the air polluted by patients in the ward will not leak out, but will be discharged to a fixed place in time through a special channel. In this way, the place outside the ward will not be polluted, thus reducing the chances of medical staff being infected in large quantities. This kind of ward is most suitable for rescuing patients with respiratory infectious diseases like SARS.
The negative pressure isolation ward for infectious diseases uses one set of air supply purification device and two sets of exhaust purification devices. The air supply purification device consists of an air supply cabinet and a coarse, medium and high-efficiency filtering device, and the filtering efficiency is 99.99%. (grain diameter ≥.3μm). The exhaust purification device consists of an exhaust hood and a coarse-effect and medium-effect filtration device, and the filtration efficiency is 99.99% (particle size ≥.3μm).