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1.29. Ventilation

Average fan
1 - To open
2 - To close
3   Installation of a stream of air up and down
4 - Installation of a stream of air to the left and to the right

Side fans
 1 - To open
2 - To close
  3 - Installation of a stream of air up and down
  4 - Installation of a stream of air to the left and to the right
Average fan
 1 - Vertical installation
2 - Horizontal installation