Which type of sprinkler heads are designed for areas below freezing?

The design of dry sprinkler heads makes them suitable for environments where temperatures can drop below freezing. Unlike wet sprinkler heads, which contain water in the pipes and are at risk of freezing, dry sprinkler heads have air or nitrogen in the pipes. This system remains pressurized with air until the sprinkler is activated by heat. When the heat melts a fusible link or breaks a glass bulb, the valve opens, allowing water to flow into the piping and out of the sprinkler head.

This design is essential in preventing water from freezing inside the pipes, which can lead to system failures and leaks. Therefore, dry sprinkler systems are specifically engineered for those colder areas to ensure reliable fire protection without the risk of freezing.