Roof ventilation performance mainly reflected? (3) step-up roof ventilation duct to collect roof air ventilators, Bengbu without power fan, the wind pushed to form a bottom discharge hot air upward actuated position; (4) any roof ventilators top direction of the wind, the ventilator is bound to a suction outlet ventilation to improve the speed bump. With the improvement of living standards in rural areas, urban living conditions improved significantly, can not live without toilets as part of increasingly demanding environmentally friendly, personalized, but many residential unvented outstanding issues outside the bathroom window. Performance is difficult to control in exhaust time, time is short exhaust vary, Liaocheng without power fan, a long time is not economical, so there have been some exhaust odor or different from each other so that energy waste phenomenon. This article will how energy-efficient exhaust proposed several options to discuss with you. If there is no need to set up outside the bathroom window ventilators, ventilators sewage gas to the main vertical duct. In the top of the main duct should generally be installed ventilators, ventilation fan should be together in the same time with the need to exhaust operation. Standard rooms with bathroom, for example, its use of the area does not exceed 6m2, a height of 2.4m, so the bathroom ceiling after volume of less than 15m3. High-rise buildings, no power fan manufacturing plant, every bathroom has a ventilation device, there is a total roof ventilators, when there is no work of a ventilator when the total roof ventilators have work, a number of ventilators when used together, turn off one of them, without power fan assembly drawings, total roof ventilators have to work, all the fan stops working, total roof ventilators stop working. Without power fan exhaust volume, Flextronics ventilators (online consultation), Bengbu without power fan ventilation equipment from the Flextronics Liaocheng Limited. Liaocheng Flextronics ventilation equipment (www.lcwctf.com) (www.lcwctf.com) is an industry leader in Shandong Liaocheng, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Flextronics ventilation in leadership with the staff warmly welcome all inquiries negotiations to create Flextronics ventilation a better future.