Pre-action Suppression System

The pre-action water mist system uses automatic sprinklers attached to a piping system containing air, with a supplemental detection system installed in the same areas as the sprinklers. System activation requires both a signal from the detection system and the heat activation of a sprinkler. Pre-action systems are used to protect areas where the risk of false discharge or leakage must be kept to an absolute minimum.

The Finnish Nature Centre Haltia Valve - Mika Huisman