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Message: <blockquote data-quote="Trixter" data-source="post: 2178645" data-attributes="member: 542668"><p>eventhough i'm a dip$hit...i'll help ya out a little. the reason your getting the variation is because of the end correction factor. since the correction factor is 1/2 the port's width, when you put in 21" wide it is considering a 10.5" correction, when you make it 4" wide it's only doing a 2" correction. if you choose "no" for slot port, the numbers will be the same. also remember that this calculator is for a pre built box. meaning what ever the length is that it calculates, you will need to find the volume and add that to the box. if the box is built, then you will need to find the port's volume, subtracat that from the original box volume and run that number again to get a new port length.</p></blockquote><p></p>

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