Home window is open inside the windowsill which can also install a layer of noise window if you installed a noise window, then you want to ventilation, then the original window
Ventilation is possible. Is installed after the original window you can not open so much, can only open to 30-45
Inside the window to install the sound insulation window to be viewed after the scene can do, some open can not install the noise window. If you can install the ventilation window ventilation is no problem, does not affect the original windows can be used as ventilation.
If the current window is installed in the main, you can install the noise window outside the existing window, if the existing windows are installed outside the main, you can not install the windows.
