Originally Posted by BridgeMan
the run has downward slope running towards the chimney, instead of upward as required.
Carbon monoxide kills.
The photo appears to have been taken from a level slightly above the top surface of the water heater so I don't think it is perspective that is causing that pipe to have a downward sloping appearance.
I'd think a small amount of CO would be trapped in that elbow, depending on whether CO is lighter or heavier than cold air or warm air.
If the blocks under the WH can be removed without bad things happening that might fix the problem.
I notice that the lady from the Shipping Dept. drives into the company parking lot with a very loud car.
I get up and head down to Shipping so I can tell her that if she gets headaches or dizziness or nausea it is because the slight vacuum in her car when it's moving (all vehicles have this) will suck in exhaust gas.
Just as I get down there she is telling someone else that she is having headaches lately and she has no idea where they are coming from.
I forget whether she thanked me for saving the lives of the rest of her brain cells.