If an area is based design features and, thus, every household installed fans or Yuba Pai, the only city in the windows above the surface, digging a hole on the wall to control access to features.

• 如某小区设计时没设排风管，于是，家家户户安装排风扇或浴霸时，都会在窗户上方那面惟一的外墙上凿个洞，以通排风管。