Is it necessary to set up upper spray for fire fighting in the ceiling? The ceiling is 3.5M high, and there are smoky lights. Of course, there is also a smoky lamp under the ceiling of my house.

As explained by the previous friends, when the ceiling clearance above the ceiling or the technical mezzanine exceeds 800mm, and there are combustible substances in it, sprinklers are required. If there is no combustible substance in the stuffy roof and technical interlayer, and the roof and ceiling are nonflammable, no sprinkler can be set.

One is to see if the ceiling leaks out of the grille. If it is a grille ceiling, even if there are combustibles, it will be sprayed upwards. One is to see if there is combustible material on the ceiling, and if not, put down the spray.