03-20-2009, 11:02 AM
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Deity
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Join Date: Apr 2004
Location: Youngstown, Ohio USA.
Posts: 2,258
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Thanked 14 Times in 14 Posts
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The maximum allowable horizontal offset from a drain opening to a trap is 30".
There would be no need to install a vent in the offset line because the line is already open to atmosphere at the drain opening.
There is no requirement to have the drain opening in the middle of your shower. The easy solution would be to build your shower pan with a continuous 1/4" per foot pitch from the front to the back and keep the drain opening in its present location.
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