I'd like to add some information I've recently found out.
First of all, people who have been curious about how jonghyun died with only one or two briquettes in a frying pan. Unfortunately I lost the source now, but believe there's a high likelihood he was using a lit yeontan and simply standing it on the frying pan. A yeontan is a large charcoal briquette used in asia which generally burns for a day, it has columns drilled throughout.
I'm curious and will be doing some research on suiciding with these, unfortunately it's a primarily asian thing so if anyone who is able to translate wants to work with me on this, please pm me and I'll work on getting some studies/info to you. Thanks.
Secondly was just some generic information on the production of CO and circumstances that increase the production of CO greatly.
When the end of a flame impinges on metal, the CO production is greatly increase (ie, when you place a metal pan onto a hob, even though it's still minuscule the CO production increases from basically zero to a notable quantity. Could this make it beneficial to use a metal grate or something similar above the flames when attempting this method? Perhaps some tests may be worthwhile
"Re-burn is the most deadly situation and is typically what contributes to the few bonafide CO fatalities that do occur. Re-burn happens when the flue does not work properly, is blocked or disconnected, or is being back-drafted by some other force like an attic or exhaust fan, or an open window during a windy day."
Reburn is when air that has already been burned by a flame is reburned, CO production massively increases as oxygen is longer being burned into carbon dioxide much less, and carbon dioxide already present in the air starts burning into carbon monoxide. This might answer some questions many of us have about ctb with a simple generator, gas appliance, gas lamps etc etc, from my understanding anything will work in a completely sealed area and it's just a matter of numbers and working out how much CO you can expect to be produced from small gas appliances and how many you may need. Once this testing is done with a few devices I think we could have a much more convenient CO method documented. I'll take a look at buying a cheap CO meter and see what I can do for you guys.