If I have a ESFR system that ask for 250gpm for hose allowance and I add 100 at base of riser for inside hose.
I have been using 150gpm outside and 100gpm inside(connect a base of riser or to another system)
for a total of 250gpm.
It doesn't matter much from where the hose allowance is coming as long they both add up to the required demand. In your case you can even have 0 GPM inside and 250 GPM outside.
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