For dry sprinklers, the exposed barrel length must be sufficient to prevent freezing. In extreme temperature differentials, such as from 50°F to -30°F, a longer barrel length, such as 18 inches, may be required to ensure the sprinkler remains functional.
References: NFPA 13 guidelines for the installation of dry sprinklers, considering the insulation and barrel length requirements to prevent freezing in cold environments.
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