I remember reading somewhere that the Israelis were told, taught, or something of the sort, that they could use their vacuum cleaners as a source for fresh air coming into the house through a hole in the wall as a means to clean the air from any NBC attack before it entered the house and/or room. I guess it would have to do with the HEPA filter and its size. Anybody else heard this before? Maybe we are on to something with that set up?
