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You make a very good point, water is not always the best way to put out a fire and it is near impossible for an automatic system to work out when it should or should not operate. I think to be fair the sprinkler system is set so the fire does need to be quite large before they work and one would hope they only really work when occupants have not responded to fire alarms. However of course there is a balance between the delay with the alarm sounding first and how big the fire gets.My local Fire Brigade performs a series of demonstrations in the town centre most years. The have a dummy kitchen surrounded by a wire mesh fence, and leave a chip pan on a gas stove until it catches fire. A firefighter then enters the fence and extinguishes the fire using a fire blanket. They then leave it on again, and when it catches fier, using a long pole, they tip a small amount of water - perhaps 1/2 an eggcup full - into the pan. Instantly there is a spectacular fireball, reaching 10 - 12 feet high.kitchen the sprinkler system may do little damage compared with the good it can do
Chip pan fire, the last thing you want is a shower of water into the burning oil
I think the link given to the Scottish government document says it all. When all risks are considered plus the cost then sprinkler systems for single occupancy houses does not make sense.
However what that has to do with an extractor fan in a garage I don't know. I do know non of the garages I have worked in had automatic sprinklers fitted. I have seen fires in a garage and these have often been associated with liquid so considering the department demo I would say automatic sprinklers in a garage could be dangerous and we all after all talking about a garage not a house.