"B" Vent Question
I have a hot water heater, and a furnace both running on natural gas. They both vent through the same chimney. A while back, the water heater was replaced and the vent from the water heater to actual chimney was replaced with new "B" type venting. I was told this was code requirement and I had no choice.
I have two questions:
1) The furnace vent joins to the hot water vent at a Y junction. Right now, the Y lies flat. Is that a requirement? I'd like to rotate the Y so the furnace vent joins in from underneath so I can move all the ducting closer to the wall, where I'll hide them.
2) The "B" venting has instructions on it that say not to use screws at the joints, or "anywhere penetration is possible". However, at all the joins, I see screws were used to fasten them. Was this installed wrong? I believe the "B" vent is to reduce the chance of carbon-monoxide escape -- so is this dangerous? Should the joints be taped, and with what? Does this meet code (I live in Ontario, Canada).
I've attached some photos showing both the Y and parts of the vent where screws were used.