perferable method to vent shower

I posted some pics that were not well received. Apparently horizontal runs in vents are not permitted. So I drew up some changes. Either configuration have a shot at passing? I'd like to get this to be a one and done inspection.

vent

Figure A is not a vent. B is okay, at least as far as you show it, assuming you have a sink connected to it to "wash" the horizontal portion. Otherwise it cannot be horizontal until you are above the spill line of the shower, or 42" above the floor whichever your inspector insists on.

The top drawing is totally wrong.
There is nothing there that would be vent the trap. Sewer gas could also come down the vent and into the bathroom if the vent is connected to other vents.


The bottom drawing will work with a LT 90 in place of the Med 90 for UPC.

Wye, rolled so that the 45 off of it is above the flow level of the water in the pipe, and then up the wall with a long turn 90.

thanks

That's the way I did it. Rolled the wye to 45 deg. as UPC insructed.

I wonder how can you vent a shower without a horizontal section?

Use a larger pipe size? so you could be further from the vent stack?