I currently have 1 8" aero port and could always order up another. What software would you recommend? http://www.lineartea.../winisd-07x.exe On a wall how much port do you need size wise?the question isn't relevant. Wall or box with the same volume better act the same otherwise you didn't seal your wall for shit. Port size can NEVER be answered by a rule of thumb but only by modeing air velocity. As for what velocity is acceptable that depends on your tolerance for chuffing noises