blueprint 101 puzzle 1

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Across
  1. 2. of symbols
  2. 3. of power
  3. 5. protective device
  4. 6. of ruler
  5. 9. drawing
  6. 10. resistant passage
  7. 11. hollow pipe
  8. 12. one line drawing
  9. 13. or rectangular pipe
Down
  1. 1. activated switch
  2. 4. figure
  3. 7. valve/reduces pressure
  4. 8. airflow
  5. 9. thermal unit