On Sun, 04 Oct 2020 11:15:14 GMT, JohnP wrote:

A school has just gone up in flames in my area. Usual photos of it burning
inside whilst water is put on the outside. Usual cries for sprinklers - but
these can be vandalised and could cause problems.

Sprinkler heads which are recessed so flush with the ceiling are
commonly used if there is a problem with idiots smashing the more
common head. when triggered by localised heat the head extends and
emits a water spray. The head sometimes uses a heat initiated wax
motor so no power supply needed.

Any thoughts? It seems a compromise to a full sprinkler system but has the
advantage of not being automatic and able to flood the building.

Being automatic is a considerable advantage, with sprinklers the fire
is usually out or well contained before the fire service arrives.
Flooding a building is generally a really bad idea, the water damage
is often more expensive than the fire damage.