This would save me from having to run the supply for the rm up the underside of.
Fire sprinkler roof manifold.
One link of many in the chain of wildfire survival in the face of an advancing wildfire a structure with a properly implemented fire smart program in combination with a rooftop sprinkler system has a survival probability of above 90.
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The purpose of the roof manifold is to test the standpipe demand and test fire pump at roof if applicable.
I have a standpipe on the intermediate landing of each of the two stairs with a fire hose valve per the ahj.
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If you have a fire pump the header should be at street level so that is out of the question.
Use either straight and angle type globe or gate type hose valves for flow control.
I dont think you need to have a combination system on a 2 storie building.
Outlet manifold fppi s outlet manifolds are typically used as a roof outlet connection for fire service professions.