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it has to be as high as the concrete you plan to pour or have poured. and yes it needs to be vented. but if you connect into existing lines it will lead to a vent you dont need to run a pipe all the way up your house and out your roof.

Well the code books I read state that before one just connects to an existing vent pipe they should know the fixture units connected and the developed length of piping and fitting as to not over load the systems BUT to each their own I reckon...
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9y ago

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