Feng Shui is: wind energy, water energy, air energy, light energy, sound energy, solar energy and all material energy in the universe, referred to as "Feng Shui". They have an impact on people and everything in the universe. It's just a matter of how big the impact is.
With windows indoors, sound transmission, air flow, smell, and light all affect everything through the windows. Of course it also affects Feng Shui.