What type of sprinkler is needed under glass or plastic skylights exposed to direct sunlight?

In the context of fire sprinklers installed under glass or plastic skylights that are exposed to direct sunlight, an intermediate temperature sprinkler is appropriate. These types of sprinklers are designed to activate at temperatures that are higher than standard sprinklers, typically in the range of 155°F to 175°F (about 68°C to 80°C).

When skylights are directly exposed to sunlight, they can transfer significant heat. Standard temperature sprinklers might activate too early due to the radiant heat from the skylights, potentially resulting in a false alarm. High temperature sprinklers, while suitable for environments prone to high ambient temperatures, could be too slow to respond in situations where rapid activation is critical. Low temperature sprinklers, on the other hand, are designed for environments that are generally cooler and would not be suitable for areas exposed to substantial heat like those under skylights.

Thus, the intermediate temperature sprinkler strikes an ideal balance, ensuring that it responds appropriately to actual fire conditions while being less susceptible to premature activation from heat sources such as direct sunlight.