Quote Originally Posted by coolwhip View Post
Whoever did that venting had their head up their flue.
Especially with an induced draft, if the vent ever gets partially plugged it gets to vent at the water heater.

Even with the old school draft box, if we did that there would be a good rise and also a Y not a T, that needs to be corrected soon, it's an accident waiting to happen.

Also we never set a furnace down into the drain pan, we jack it up some to keep the water from being drawn into the blower it "will" seep through that bottom door, the suction will draw it in.