I had a direct vent today on a 50 gal State Water heater that I have question on. The vent itself makes more of a loop going up then down and through the wall. The pipe loops up about a foot or so before turning down and exiting out. Will this configuration draft properly? The owners manual was there and I looked through it and it gave clearances and a diagram. It did not specifically caution against doing a loop rather than an elbow. Doing some more research online, most install directions show right angle configurations. I did not see any signs of condensate or corrosion. It was installed in 07.
Any qualified expertise appreciated.