Mr Blamo
Well-Known Member
If you have a furnace or water heater going up your chimney don't vent out on the chimney... as a former heating technician I recommend you never vent into a chimney
You risk death to everyone in the house.
Now if you don't have nothing through your chimney you can use it to vent.
I have used mine for a few years as I don't have anything else going through it.