How many temperature classification categories are there for sprinkler heads?

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Sprinkler head temperature classifications indicate the ambient heat level at which the head will release water. To keep things consistent across manufacturers and installations, there are seven standard temperature classifications. This range lets designers choose a rating that matches the normal temperatures of a space while still ensuring activation when a fire occurs. In hotter environments, a higher rating helps prevent premature activation from ordinary heat; in cooler spaces, a lower rating ensures timely response. The seven categories provide the right balance of specificity and practicality for typical building conditions.