Originally Posted by
CHARLIE VAN FLEET
----also should that top opening be covered because of the other stack exit---
Charlie,
That furnace looks like it was made for upright or side mount thus the two opening in the cabinet.
I don't think there is a covering made for that opening.
The only sure way to tell would be to read the install instructions.
I would report the flex, gap,CO readings call for a Licensed HVAC and let it go.
