A match was used to ignite the sofa. Within 40 seconds after ignition, the smoke detectors in each room activated. The fires in both rooms continued to grow. At 85 seconds the residential sprinkler activated in Room B. As a result of the water spray from the sprinkler in Room B, the fire is suppressed and safe conditions are maintained. The fire in Room A continues to grow.
Times are in seconds from ignition.
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