port size?

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jlshea

Member - Posts: 5

Joined: October 27, 2011

Location: Nebraska, United States

Posted: October 29, 2011 at 3:13 PM / IP Logged

With a 4" PVC pipe inside diameter is 4" but outside is 4.5". Do you use the 4.5" diameter because that affects the box volume?? Using cal on this site 4"= 10.45"length 4.5"=13.7 length. The box vol is 1.75 Ft^3, Fb= 38

TK jim

Installer dad

i am an idiot

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Joined: September 21, 2006

Location: Louisiana, United States

Posted: October 29, 2011 at 11:02 PM / IP Logged

Use both. Use the I.D. for the port size and length. Then you have to use the O.D. to figure out how much volume the port takes out of the box volume.

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port size?

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