Should the flame in my gas fire be orange or blue?
Carbon monoxide is produced when a fire does not have enough oxygen. When the fire is orange it means that there is less oxygen accessible for combustion but it doesn’t mean the fire is necessarily producing carbon monoxide. The chimney acts as a way of evacuating the fumes and not oxygenating the burning process. If the fumes have trouble going up the chimney they will come back into the house. It is very important to have proper ventilation when using a gas fire. I suggest you make sure that the fire is properly ventilated and if you are worried then get a carbon monoxide alarm. They’re not very expensive. Carbon monoxide is odorless and causes drowsiness and headaches.
