Merging flow from stair above and from stair below final exit level

Calcualtes the merging flow from stairs above and below the final exit level

Equations

W_{FE} = S_{up} + S_{dn} or W_{FE} = B \cdot X + 0.75 \cdot S_{up}

Stair width for upward portion of the stair ( S_{up} ) — mm

Stair width for downward portion of the stair ( S_{dn} ) — mm

Number of people served by the stair from below the final exit level ( B )

Distance from the nose of the top going of the downward portion of the stair ( D ) — m

Minimum door width per person ( X ) — mm/person