Unidirectional flow air system unidirectional flow system is based on a diversified mechanical exhaust ventilation system central air intake and the nature of the three principles of mechanical ventilation systems combine to form by the fan, the inlet and exhaust ports and a variety of channels and joint composition. Wind turbine installation in the ceiling through a pipe connected with a series of air vents, fans start, indoor stuffy air were installed in the indoor air suction fan vented to the outdoors through a central vacuum system ranking, the negative pressure in the room several effective form area, indoor air continuous flow to the negative pressure zone and exhausted to the outside, outdoor fresh air from the air inlet mounted (between window frame and wall) above the window frame continuously added to the room, so you have to breathe high Quality of fresh air. The new air system air supply system, but without air duct connection to a central vacuum system manufacturers, and the exhaust pipe is usually installed in hallways, bathrooms and other places usually have a ceiling of the central vacuum system, essentially no additional space. People on healthy living calls for a gradual increase of the indoor living environment needs to improve home central vacuum system, creating the concept of environmental health room, for domestic and international famous brands of central vacuum and central air system products for study and research. Nanjing Environmental Engineering Equipment Co., Ltd. Keao production, is the early development of integrated operational environmental protection products, and other business areas of the company. The company has many years of indoor central air system and central vacuum cleaning system solution to quality, design, construction and management experience. Welcome to inquire! Household central vacuum system, Keao environment (certification), central vacuum system, provided by the Nanjing Environmental Engineering Equipment Co., Ltd. Keao. Keao Nanjing Environmental Engineering Equipment Co., Ltd. (www.njxfxt.com) is Nanjing, the other leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Keao environmental leadership with the staff warmly welcome all inquiries negotiations to create a better future Keao environment.