Please discuss the issue of the air coefficient (everyone is welcome to participate)

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It’s an old issue: I’ve seen in many books on coking that the air coefficient can range from 1.1 to 1.2. However, the values I obtained from two JN60 coke ovens were 1.35–1.4 (samples taken from the exhaust gas ducts on the machine side and the coke side respectively), which is quite different from the values given in those books. Yet the technicians in my workshop said this is normal. I would like to ask everyone to discuss what the actual air coefficient values are in practice across different factories. Please provide information on the type of furnace, the methods used for sampling and analysis, as well as the air coefficient values. It would be great if the information is presented in the following format. Thank you. First, let me start: Furnace type: JN60; Sampling taken from the exhaust gas ducts on the machine side and the coke side – 1.35–1.4