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The 1st floor lav's vent proceeds to 6" above the 2nd floor lav's rim, where it joins the main stack vent.

The fitting that it and the lav sink drain enter the 4" main is a 3" combination wye+1/8 rolled 45 toward the wall. A wye plus a 45 elbow would fit in the available space, too. The 1st floor lav's vent proceeds to 6" above the 2nd floor lav's rim.

The other pipe by the lav sink is the soil stack from the 2nd floor bath.

So the toilet vent must be on the toilet branch itself, or at least downstream of where the toilet branch drains into the 4" main? What is a running trap? The shower trap is about 16" from the shower drain. The drop from the drain to the trap is about 8". The vent is less than 5' from the shower...

I'm trying to configure a toilet, a bathtub/shower combo, and a dry vent in a 6 x 10 1st floor bathroom. My county uses 1999 BOCA code. Can the 2" dry vent be positioned as shown, upstream of the toilet? What other tips can you provide? For example, use a wye as a cleanout instead of a co tee...