What type of system would typically be used in areas susceptible to freezing temperatures?

In areas susceptible to freezing temperatures, a dry pipe system is typically utilized. This system is designed so that the pipes leading to the sprinkler heads are filled with air or nitrogen instead of water, which helps prevent the water from freezing within the pipes. When a fire is detected, the pressure in the system drops, triggering a valve to open and allowing water to flow into the pipes, thus reaching the sprinkler heads. This mechanism is crucial in preventing pipe bursts that could occur in a wet pipe system, where water is constantly present in the pipes and at risk of freezing.

In contrast, wet pipe systems contain water in the pipes at all times, making them unsuitable for areas with freezing potential. Deluge systems are activated by heat or smoke detection but release a large volume of water over a wide area simultaneously, and pre-action systems combine elements of both wet and dry systems but are still not ideal for freezing environments due to their initial filled pipes. Therefore, the choice of a dry pipe system in freezing conditions aligns with the need to protect the integrity of the system while ensuring that adequate fire protection is still provided when needed.