When the standpipe system has an automatic water supply or is part of a combined system, a main drain should go to the exterior of the building.
This is known to be a system that is made of piping and hose linkage tht is often installed in all of a building to give reliable water for use.
Note that in the above scenario, When the standpipe system has an automatic water supply or is part of a combined system, a main drain should go to the exterior of the building.
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