During my third mock inspection I ran into this. The water heater flu goes through a box and out through the chimney. There is also a 4 inch vertical down tube that goes from the box down to about two inches off the floor. I assume that there is some sort of baffle in the box. Could this arrangement allow co into the basement. I am trying to post a photo, but I’m not having any luck. I tried the photo again…if it is here it looks like poor quality
Thanks for your help
