..but the flue still falls outside of the minimum requirements. And they are requirements, not recommendations. So when you follow the chart "does a situation exist which may lead to an unsafe situation". In my eyes yes it does. An extremely windy day, could blow POC's back into the opening. So the appliance is at risk and should be turned off until rectified. After all, I don't want to be the "other guy" .
And regarding NCS, in my training, we was told that instead of NCS we now have 2 categories of AR, 1. Where turning the appliance off would remove the risk and 2. Where turning the appliance off wouldn't remove the risk.
From what I can gather, it's to make the warning system clearer for the client. Label something as NCS and the client will take no action, label it as AR and the client will be more likely to act. So as far as I'm aware, when an appliance is non compliant, we fill out a warning notice but we don't attach a label and we don't turn the appliance off.
TBH, you have slightly confused the 2 types of AR issue. There are a couple of instances where this applies, one of which is a built over service. You issue a Notice, but not a Label. There are one or 2 similar ones, but cant think of them right now. It has nothing to do with NCS.
The new system WAS brought in to try to avoid confusion. I assume you were not around with the old? We had a DO NOT USE label, which was only used on ID - IIRC, there was no AR label, just a notice, but I am honestly not sure. Either way, both AR and ID are now labelled more emphatically.
NCS was removed from the UP as it felt it was confusing and diluted the message. (I am not convinced, but that is another debate). You can still write down NCS but NOT on a warning notice.
Re non compliance = automaticaly AR: Absolutely not.
You have presumably not had the advantage of seeing the old Unsafe Procedure Book, which listed many more scenarios, which were indicated as NCS. The scenario in question would have been in the old book. If I can find an old one, I will copy and post.
For example, a cooker point should be 750mm above the floor. Would you AR it if it was 650mm? The 750mm is a REQUIREMENT as well. There are countless examples.
Without looking it up, do you remember, if specifically told, or work out, what the classification is for an ECV that is passing gas when OFF?.
On an extremely windy day, the POCs will be massively dispersed and diluted. No way will they enter through the grid on the old terminal (I assume you do know what the outer wall part of that terminal in the picture is like?)
Just noticed your last comment:
So as far as I'm aware, when an appliance is non compliant, we fill out a warning notice but we don't attach a label and we don't turn the appliance off.
That is wrong. With the exception of the couple I mentioned earlier, every Notice is accompanied by a Label. You DO NOT use a WL for anything other than a declared AR or ID.
Incidentally, how would you "turn off" an AR appliance?