How is this port length 30 inches?

bassman3 Gold Member Username: Dustin3 Tigard, OR U.S. Post Number: 2967 Registered: Oct-05	Posted on Friday, August 11, 2006 - 21:30 GMT http://www.subwoofertools.com/forum/ported-box.asp?Ew=20&Eh=16&Dia=6&Xmax=.48&Vd =.07&NumW=1&Vb=1.95&Fb=32&Qts=&Vas=&Fs=&CE=0 the math doesnt add up...
bassman3 Gold Member Username: Dustin3 Tigard, OR U.S. Post Number: 2968 Registered: Oct-05	Posted on Friday, August 11, 2006 - 21:47 GMT never mind. i got it figured
Steven Norris Gold Member Username: Stnorris IA US Post Number: 1126 Registered: Apr-06	Posted on Friday, August 11, 2006 - 22:05 GMT ya ur welcome