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this is also known as the ACTION LEVEL , a level at which work is required.
Back Boiler only maximum allowed 0.008 co/co2
also known as action level.
anything above these readings after a full service is classed as immediately Dangerous as per the Gas Industry Unsafe Situations Procedure (4th Edition) , appliance failing to achieve a satisfactory combustion ratio.
The STANDARD is only issued for guidance and the manufacturers instruction must be referred to at all times and followed !
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