The invention discloses a building. The building is provided with an air supply pipeline capable of providing
breathing air, wherein an opening or an expandable opening is formed in the
pipe wall of the air supply pipeline; a part, at one side of the opening, of the
pipe wall is fixedly connected with one end of a sealing strip; the other end of the sealing strip and a part, at the other side of the opening, of the
pipe wall are magnetically attracted, or, the other end of the sealing strip and another sealing strip connected with a part, at the other side of the opening, of the pipe wall aremagnetically attracted; a vent pipe can be inserted into the opening and the sealing strip is moved to communicate with an inner hole of the air supply pipeline; the sealing strip wraps the vent pipethrough magnetic attraction, or, a part, at the side of the opening, of the pipe wall of the air supply pipeline wraps the vent pipe; and the air supply pipeline is capable of providing air meeting the need of
breathing.