American Energy Systems MagnuM Winchester - Manual (Page 23)

23
It is not recommended to
run the fresh air to the
top of the chimney
It is best to route the fresh air intake either
out the back of the fireplace cavity or down
and out to an outside air source. Running
the fresh air up and out the top of the
chimney can cause excessive draft issues.
Your installer will determine what type of
leveling bolts or other means that will level
the unit properly.