Notes to Table 7.5.8.3.:
7.5.8.4. Vent Stacks, or Stack Vents (1) A vent stack, or stack vent shall be sized in accordance with Table 7.5.8.4. based on, (a) the length of the vent stack or stack vent, and (b) the total hydraulic load that is drained to the lowest section of soil or waste stack or stacks served by the vent pipe, plus any additional vent loads connected to the vent stack or stack vent. Table 7.5.8.4.   Size and Developed Length of Stack Vents and Vent Stacks Forming Part of Sentence 7.5.8.4.(1)  Column 1   Column 2   Column 3   Column 4   Column 5   Column 6   Column 7   Column 8   Column 9   Column 10   Column 11   Column 12   Column 13 

  Size of Soil or Waste Stack, in.   Total Hydraulic Load Being Vented, fixture units   Water OccupiedArea   Size of Stack Vent or Vent Stack, in.                         

              1¼   1 ½   2   3   4   5   6   8   10   12 

              Maximum Length of Stack Vent or Vent Stack, m(1)(2)                 

  1¼   2   0.29   9   NL   NL   NL   NL   NL   NL   NL   NL   NL 

  1½   8   0.25   15   46   NL   NL   NL   NL   NL   NL   NL   NL 

  2   12   0.25   9   23   61   NL   NL   NL   NL   NL   NL   NL 

      24   .29   8   15   46   NL   NL   NL   NL   NL   NL   NL 

  3   10   0.15   NP   13   46   317   NL   NL   NL   NL   NL   NL 

      21   .20   NP   10   33.5   247   NL   NL   NL   NL   NL   NL 

      53   .25   NP   8   28.5   207   NL   NL   NL   NL   NL   NL 

      102   .29   NP   7.5   26   189   NL   NL   NL   NL   NL   NL 

  4   43   0.15   NP   NP   10.5   76   299   NL   NL   NL   NL   NL 

      140   .20   NP   NP   8   61   229   NL   NL   NL   NL   NL 

      320   .25   NP   NP   7   52   195   NL   NL   NL   NL   NL 

      540   .29   NP   NP   6.5   46   177   NL   NL   NL   NL   NL 

  5   190   0.15   NP   NP   NP   25   97.5   302   NL   NL   NL   NL 

      490   .20   NP   NP   NP   19   76   232   NL   NL   NL   NL 

      940   .25   NP   NP   NP   16   64   204   NL   NL   NL   NL 

      1 400   .29   NP   NP   NP   15   58   180   NL   NL   NL   NL 

  6   500   0.15   NP   NP   NP   10   39.5   122   305   NL   NL   NL 

      1 100   .20   NP   NP   NP   8   30.5   94.5   238   NL   NL   NL 

      2 000   .25   NP   NP   NP   6.5   25.5   79   201   NL   NL   NL 

      2 900   .29   NP   NP   NP   6   23.5   73   183   NL   NL   NL 

  8   1 800   0.15   NP   NP   NP   NP   9.5   29   73   287   NL   NL 

      3 400   .20   NP   NP   NP   NP   7   22   58   219.5   NL   NL 

      5 600   .25   NP   NP   NP   NP   6   19   49   186   NL   NL 

      7 600   .29   NP   NP   NP   NP   5.5   17   43   170.5   NL   NL 

  10   4 000   0.15   NP   NP   NP   NP   NP   9.5   24   94.5   292.5   NL 

      7 200   .20   NP   NP   NP   NP   NP   7   18   73   225.5   NL 

      11 000   .25   NP   NP   NP   NP   NP   6   15.5   61   192   NL 

      15 000   .29   NP   NP   NP   NP   NP   5.5   14   55   174   NL 

  12   7 300   0.15   NP   NP   NP   NP   NP   NP   9.5   36.5   116   287 

      13 000   .20   NP   NP   NP   NP   NP   NP   7   28.5   91   219.5 

      20 000   .25   NP   NP   NP   NP   NP   NP   6   24   76   186 

      26 000   .29   NP   NP   NP   NP   NP   NP   5.5   22   70   152 

  15   15 000   0.15   NP   NP   NP   NP   NP   NP   NP   12   39.5   94.5 

      25 000   .20   NP   NP   NP   NP   NP   NP   NP   9.5   29   73 

      38 000   .25   NP   NP   NP   NP   NP   NP   NP   8   24.5   62 

      50 000   .29   NP   NP   NP   NP   NP   NP   NP   7   22.5   55