fire tower

/F AY1 ER0 T AW1 ER0/
noun
  1. 1

    A watchtower to search for fires in a forest.

  2. 2

    In a high building, a stairway protected by several inches of concrete and entered through a kind of "air lock" that prevents the smoke to enter inside it.

Source: https://en.wiktionary.org/wiki/fire%20tower