The patron saint of
fire protection is Catherine of Siena.
Our source says
It is unclear why Catherine is the patron of fire protection. Perhaps it is due to the fact that in one of her many visions of Christ, she exclaimed, “Then I saw God-and-man, as one sees the brightness of the sun, receiving that soul in the fire of His divine love.”
The question (& answer)
were found on p. 146 of Patron Saints by Michael
Freze, S.F.O. The book was published by
Our Sunday Visitor Publishing Division in 1992.