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A new piece of building code in the state of Minnesota will require fire sprinklers to be put into new townhomes, single-family and duplex homes that are larger than 4,500 square feet.
This is the type of backflow preventer that I use on most of my designs. The R.P. Unit must be installed 12 inches (300mm) above ground, but it does not have to be higher than any of the sprinklers. It may not be installed in any location where it might ever be submerged under water.