What color is the bulb for an intermediate head?

The correct answer indicates that intermediate heads, which are typically used for specific temperature classifications in fire sprinkler systems, are identified by a blue or green color bulb. This designation is crucial for the appropriate selection of sprinkler heads based on the operational environment and temperature requirements.

Intermediate temperature heads are usually designed for use in conditions where temperatures can reach up to 155°F (68°C). The colored bulbs serve a dual purpose: they help in quick identification by installers and maintenance personnel, and they also indicate the activation temperature of the sprinkler head.

Different colors are used to signify different temperature ranges, ensuring that the right type of sprinkler head is installed for the required fire protection scenario, which is vital for effective fire suppression. Red and yellow bulbs typically refer to other classifications, such as standard and quick response sprinklers, and green bulbs often signify lower temperature ratings. Therefore, knowing that blue or green denotes the intermediate head is essential in ensuring effective fire safety management.