Principle II: determine the minimum amount of exhaust inside the housing to meet people's daily work, the amount of fresh air needed rest. According to national norms ventilation wind chassis production, 30 cubic meters per person per hour must be guaranteed, or ACH time, whichever is greater. The new wind ventilators with full delivery of fresh air, the whole row of old style way of working will not cause cross-contamination. The new wind ventilators selected low-noise wind chassis fan shape, also conducted a silencer processing machine, to protect the interior quiet. In ensuring the interior has enough fresh air of the premise, the use of new wind ventilators, will greatly reduce the energy consumption of air conditioning or heating, so it is both an environmentally friendly product is an energy-saving products. Wind chassis installation, rich ventilation equipment (certified), wind chassis provided by Dezhou Plumper ventilation plant. Dezhou Plumper ventilation plant (www.frtfsb.com) (www.frtfsb.com) is a leader in Dezhou, fans, ventilation equipment, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum limits to meet customer needs. Rich ventilation equipment in leadership with the staff warmly welcome all inquiries negotiations to create rich, ventilation a better future.