Xringer, i hear you. I havent done a thing yet and am running it through in my head to see the pitfalls. The reason i'm not too concerned so far is that the boiler is fed by a fan that would push air up, down, across, whatever. So no matter what heat i take from the chimmney, the airflow would still hopefully be strong. I thought of haing the chimmney in the down position due to the cooling effect on the gas and therefore that would in theory, help the gas flow, if help were needed. Again, i'm open to suggestion.
ollie
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