Circuit venting question

[jayare]

Hey guys, long time lurker, first post. Sorry for the terrible drawing, but im just wondering if this bathroom group is properly circuit vented, it one water closet, a tub, a shower and two lavs. The dotted lines are the vents. Any corrections are appreciated. Im in Alberta btw.

[Sean Beck]

Would probably be easier to wet vent everything upstream of the toilet, providing you have room for a 3" pipe. Run 3" upstream of the toilet, all the way to the double tee wye of the 2 basins. A 3" wet vent serving a toilet can take up to 8FU (fixture units). Bathtub (1.5) + shower (1.5) + 2 basins (1 each) = 5FU