Window ventilation: external structure attached to the building wall and door between (doors, windows, walls) or on, a certain wind pressure in working condition, watertight, airtight, acoustic and other properties without a motor turbine roof fan, and can achieve a controlled indoor ventilation devices. Can be installed in any window type and location, can be mounted on the window frame, also can be mounted on the bottom sash noise axial roof fan can also be mounted as the lower part of the windowsills throughout the sill. Window ventilation can be mounted horizontally, vertically mounted; can be installed in the upper portion of the glass to be installed in the lower part of the glass. Natural ventilation: relying on indoor and outdoor temperature, air pressure and other air pressure difference generated ventilation window ventilation device. Wall Ventilation: It is hanging on the wall ventilation dwt series roof fan roof fan _ _ Wuhan Flextronics Flextronics ventilation consists of Liaocheng ventilation equipment Limited. Liaocheng Flextronics ventilation equipment (www.lcwctf.com) (www.lcwctf.com) strong, credible, in Liaocheng fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Flextronics ventilation into the brilliant and you work for a better future!