Also for the grease fire - water from a sprinkler is applied in fine droplets, almost like a mist. This will lessen the flare up and quickly cools the grease below its ignition temperature. You will still get a flare up, but most likely the fire is unattended. For the attended fires, I've had sprinklers activate when one takes a burning pan of grease to the sink and water from the sink is applied. When the fire rages up the wall the sprinkler activates and quickly quells the fire before it spreads.
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NFPA 13R states that for ordinary temperatures at the ceiling level (< 100F), the sprinkler head(s) activate in the range of 135-175 F. Relative to the heat at which a fire burns, not really that hot.
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True, but you have to consider the size of the room, size of the fire, and how far away the sprinkler head is. Can't have an activation whenever someone opens an oven.
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Thanks for the info clanker and the rest of you fine folks.
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