WebThis will involve making enquiries with the occupants of the neighbouring property. In these situations and on the basis of checks of the boiler and the chimney/flue system in the … WebFlue gas analysers usually display a CO/CO2 ratio. This shows the ratio of carbon monoxide and carbon dioxide in the exit flue (chimney) of the appliance. Generally when this level is below 0.004 the boiler is considered to be running efficiently. When between 0.004 and 0.008 this indicates a potential problem and investigation and retesting ...

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