Carbon monoxide in dwellings and other premises and the combustion performance of gas-fired appliances. Guide for using electronic portable combustion gas analysers in non-domestic premises for the measurement of carbon monoxide and carbon dioxide levels and the determination of combustion performance|Cookers, Carbon monoxide, Electronic equipment and components, Maintenance, Commercial, Boilers, Gas-fired heaters, Buildings, Ventilation, Combustion products, Business facilities, Safety measures, Gas analyzers, Gas detectors, Performance, Portable, Gas analysis, Combustion, Carbon dioxide, Gas-powered devices