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  1. MYHVAC

    Max. flow in a 4" fire feed main (below ground) for a combined system

    I need to supply 800 GPM (540 GPM to sprinklers and 250 GPM hose allowance)to a combination fire protection system. Can 4" line be used between street main and a riser? System's riser was sized to be 4". NFPA 13, section 8-2.1 requires a flow rate no less than 390 GPM thru 4" line...

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