Heap of steaming shite! No sources and abject conjecture everywhere! Simply claiming you're an engineer is not source. I've had enough of this subversive BS. The method employed here is to repeat the same crap enough times until the lies are accepted as truths because they pervade social networks because so many people are incapable of understanding that these claims are total bullshit! Even those that claim to provide sauce are sourcing non-credible sources! Unless it has been proven scientifically by recognised scientists, it's not credible! There are scientists tat do not conform to the mainstream and they are also sources of credible scientific knowledge but these guys are never quoted. Why? Because they cannot prove the crap that gets multiple posted on these boards and social media!
Yes, They were installed in the house opposite around 1990! Not that design but extremely effective! saved on daytime electricity and heating, still there and operating as new.
This incarnation seems over-designed to ensure it will "wear out" and need replacement. Still is noice to see that the new generation is still capable of some thought, just not real critical path analysis. Meh.
Funny thing about airliners; their wings are also their fuel tanks so having a raging fire right there isn't really a good idea, hence, the fuel cutoff. Really logical, in fact!