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Text File  |  1995-04-27  |  249b  |  5 lines
  1.   Air
  2. Page 2
  3. When indoors you must be careful to make sure that you have a constant supply of fresh air.  
  4. In this room the plants and people are using up the air, which needs to be constantly replaced.  In most cases, opening the window is enough.
  5.