I had to hang curtains for an old aunt todat, she lives in a terrace house built in the 1950,s, I noticed the front bedroom had no vent and the front wall where the window is seemed to be damp with the bad whether we have had lately. I suggested she leave the small window open as much as possible in the bedroom. also a few years back she got the gas and the boiler is in the same room, should she get a proper vent kangoed out ,and since the wall seems damp will that naturally dry out with air been let in to the room. Is it common for old council houses not to have vent,s especially this been a terrace house, other rooms all have vents except the front bedroom. could there be permanent damage. also would a lump hammer and chisel be enough to make a hole for a vent,