The fireflow requirement is the quantity of water in gallons per minute, measured
at 20 psi residual pressure, that is available for fire fighting.
Fire area is the total floor area in square feet for all floor levels within the
exterior walls, or under the horizontal projection of the roof of a building. Each
portion of a building separated by one or more four-hour area separation walls
with no openings and provided with a 30" parapet constructed in accordance with the
Building Code may be considered as separate fire areas for the purposes of
determining the required fire flow.