Hiller Systems - Sharing information that MATTERS !
Via the USFA (Automatic Sprinklers: Dry Pipe Differential Principle) - Dry pipe sprinkler systems commonly are used where the ambient temperature of the space they are protecting is expected to be less than 40 °F (4.4 °C). The sprinkler pipe is filled with compressed air or nitrogen that is released when a sprinkler opens and allows the dry pipe valve to open, filling the overhead pipes with water. Read more here.
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