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This clip, produced by the Fire Protection Association, forms part of the tests undertaken by the FPA for the Department of Communities and Local Government. It clearly shows the effectiveness of a standard residential sprinkler head operating at 49 litres/minute. Any system installed to BS 9251: 2014 will hve the same effect, obviously the operating time will depend on the distance of the sprinkler head from the stove and the height of the ceiling.
The FPA's own commentary is: