I did call a professional but I am seeing how many more 8" lines can be installed on this trunk line since the "professionals" sized one of my rooms to small. I have adequate velocity just not enough volume. I am calling them back out here to fix it but I wanted a second opinion. I do not want to starve the other lines with this change. How many 8" lines, 6" lines, etc can be installed on this 14" or 12" trunk line? That is the question.