I have an 83,000 sqft total (3-story) Type II-B new construction building under the International Fire Code.
Under IFC Table B105.1(2) I get a straight-table Fire Flow of 6,000 gpm at 4 hours.
However, IFC Table B105.2 allows buildings with automatic sprinkler systems to have a "Minimum Fire Flow" of "25% of the value in Table B105.1(2)", and a "Flow Duration" of the "Duration in Table B105.1(2) at the reduced flow rate".
With a sprinkler system, the Fire Flow becomes 1,500 gpm (= 6,000 gpm x 25%), that's pretty straight forward.
However, is the Flow Duration straight from the original reading of Table B105.1(2) (which is 4-hours) or is the duration taken from Table B105.1(2) at the new reduced Fire Flow Rate (lookup 1,500 gpm to get 2-hour duration)?
In short, is a 83,000 sqft Type II-B building Fire Flow actually 1,500 gpm at 4-hours, or 1,500 gpm at 2-hours?
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