Moving Shower - Venting Question

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Stephan Bond

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I am doing a bath remodel which involves moving the shower across the room - currently 2 sinks, shower and tub drains are upstream from toilet - all feeds into same 3" pipe and is vented at the sinks with a 2" vent pipe thru the roof.

I am moving the shower across the room which means it will now connect to the 3" main drain using a 3" to 2" Wye PVC and Ptrap below the toilet.

questions:
1. given this layout, does the shower need special venting other than what currently exists,
2. if yes, the drain is centered in a 48x48 shower base, meaning it's 24" from the shower wall where one plumber told me I could install a 2" vent run into the wall right into the attic and cap it with a Studor vent cap.
he explained that flushing the toilet could suction out the shower ptrap and cause sewer gases to come thru the shower drain (only 1 of 3 plumbers pointed this out to me BTW so I am questionning the validity)
3. if i do need an extra vent , where would be the logical place to connect it?
4. regarding the 3" Wye to 2", should the 2" leg be horizontal to the side or at 45 deg or on top of the 3" pipe?

Thank you
 

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