What does the IBC say? If there were townhouses (not since units divided per floor), then a 13D could be used with minimal rated separation per the IRC. The code drives the allowed type of system, not how small you make each individual system. Make sure the tamper switches are electrically monitored so it is known when one of the risers in the middle of the building is shut-down.

Roland

On Nov 18, 2008, at 11:26 AM, IPA wrote:

I have a residential complex consisting of two story units with two
individual units per floor. Obviously this would fall under 13R however in this case the owner wants each unit to have it's own seperate riser control, it's own underground feed etc... each unit is 100% independant from the others. In this case could this system be calculated to 13D criteria (2 head calc) seeing how each system is serving only one family's unit? What do you
think?

Thanks,
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