Alfaman sums up the situation in a clear & concise manner.
It is very unfortunate that CO poisoning occurred. The maintenance quality of the ac is clearly called into question.
The deadly Swiss Cheese model rears its ugly head…usually there are something like 10 events in the ‘chain’ leading to an accident. Break the chain at any point and the accident would not have occurred.
We await sentencing on 12 November, & the Inquest February 2022.