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 G03 Environment and Public Health D004778 +
  G03.230 Environment D004777 +
   G03.230.150 Environment, Controlled D004780 +
     G03.230.150.050 Air Conditioning D000389 
     G03.230.150.150 Diving D004242 
     G03.230.150.300 Heating D006361 
     G03.230.150.360 Housing D006798 
     G03.230.150.372 Humidity D006813 
     G03.230.150.391 Life Support Systems D008021 
     G03.230.150.410 Lighting D008029 
     G03.230.150.450 Temperature D013696 
     G03.230.150.520 Ventilation D014691 
     G03.230.150.225 Ecological Systems, Closed D018504 
     G03.230.150.440 Space Simulation D018561 +