Positive pressure air supply should be set between the fire elevator room, stairwell front room and stairwell. Intermediate front stairwell room and stairwell to select a place to install the line the main purpose is to reach the pressure, so that the smoke could not come on the line. Front room is open every mouth floors are an outlet pressure delivery outlet size, stairs to open a two-story outlet. Domestic design in accordance with regulatory requirements is not greater than 7 m positive outlet pictures, but Singapore's design is usually considered positive 4 m outlet types, because if a big influence on the door, some girls are thinner, it is difficult to open. Installation height 300 ~ 600mm from the ground can be positive outlet prices, rich ventilation equipment (certified), pressure delivery outlet provided by Dezhou Plumper ventilation plant. Dezhou Plumper ventilation plant (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, and satisfy customer needs. Rich ventilation equipment in leadership with the staff warmly welcome all inquiries negotiations to create rich, ventilation a better future.