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Message: <blockquote data-quote="iamamp3pimp" data-source="post: 2242584" data-attributes="member: 550386">Vent length explained by picsLets say that you need a perfect 30 inch long port, the port begins at the opening of the box, and not at the beginning of the first port piece (.75 or 1.5 inches in)  this particular port is 4 inches wide, meaning that through the whole port, it needs to be 4 inches in diameter, or as close as possible @ all times.since it is 40 inches wide, we all agree that the center part is 2 inches away from each wall, meaning that the length of the port extends past the first wall, and on to the second, but what you have to remember is that is also port length that needs to be accounted for.ths pic explains it better than i can though<img src="http://img219.imageshack.us/img219/8483/portwo9.th.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

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