Which type of sprinkler system may not be suitable for areas with freezing temperatures?

Wet sprinkler systems utilize water that is already contained within the pipes and is commonly kept under pressure. In freezing temperatures, the water in these pipes can easily freeze, leading to pipe damage, system failure, or a blockage that can prevent the sprinkler from functioning properly during a fire situation. Therefore, wet sprinkler systems are generally not suitable for areas that experience low temperatures unless special precautions, like insulation or heating elements, are employed to prevent freezing.

On the other hand, dry sprinkler systems contain pressurized air or nitrogen in the pipes, keeping the water supply in a separate area until activated by a fire. Preaction and deluge systems can also be designed to operate in freezing conditions using methods to prevent water freezing in the pipes. Thus, wet sprinkler systems are the type that may present significant challenges in freezing temperatures.