Fire FESS

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Across
  1. 3. A British Standard covering Fire installations (6)
  2. 4. The unit of measurement of sound pressure levels (7)
  3. 7. Visual Alarm Device (3)
  4. 9. square root of 64 (5)
  5. 11. setting fire to a building deliberately (5)
  6. 12. Manual Call Point (3)
  7. 15. 211 x 4 (3)
  8. 16. Temperature measured in a room (7)
  9. 17. what happens if something else happens (6)
  10. 18. P rated (8)
  11. 20. the reason why (5)
  12. 21. Rate of Rise Detector (3)
  13. 22. The type of detector not to install on escape routes (4)
  14. 23. L rated (4)
Down
  1. 1. A system that analyses air sucked through piping (10)
  2. 2. how many decibels are lost when sound travels through a fire door (4)
  3. 5. Liquid Crystal Display (3)
  4. 6. Used as EOL devices on some conventional panels (9)
  5. 8. your meter leads should comply to this (4)
  6. 9. Fire equipment must comply to this Euronorm (4)
  7. 10. a method used to detect smoke (7)
  8. 13. A fire panel manufacturer (4)
  9. 14. provides back-up power (7)
  10. 19. Electricity at work regulations (4)
  11. 20. The king of the United Kingdom (7)