If I had to criticize one thing, I'd point out that the air scoop is too close to that 90 degree bend. You want a nice straight run of pipe (18" usually) ahead of the scoop so the air bubbles rise to the top of the pipe/scoop. Moving it farther away from the 90 would also put it farther away from the boiler...so when the air vent leaks or you need to change the expansion tank , those pretty sheet metal covers won't get dirty or dented. I am sorry that I didn't notice it before everything was soldered, but I thought it was still worth pointing out. With that said, don't get mad - the system will probably work fine the day it is. The purge valves will take the frustration out of venting the air from the zones, and the air scoop should eventually get the rest.