In case of Balcony Spill Plume, the equivalent width of plume shall be calculated as per NFPA 92 2015Ed, 18.104.22.168.
This plume width is a governing parameter of calculated mass flow rate for balcony spill plume by algebraic equation, I think.
However, the distance from opening to bacony edge, b, can be a disputable parameter considering shape of balcony edge and location of opening as attched.
Would you please give me any guidance how to measure the distance of b or an alternative method like 45 degree angle from opening edge to estimate plume width for unchannelled smoke?
Thanks in advance.