First off, I don't suggest anyone ctb. Only you can make that decision for yourself.
A bbq can work. You will need to, most likely, do some sealing of seams and vents in the tent. Do you know how much charcoal to use? Without actually performing tests and measuring CO, it's a bit of a gamble. But hey, plenty of others have done pretty much just about what you're contemplating and have been successful. My advice is to use a lot of charcoal. Better to use more than enough than not enough. Buy good charcoal that is 100% carbon. Start the grill outside and let impurities burn off (smoking). When coals are ready there will be no, or very little, smoke and the coals will be red/white hot. That's when CO production is highest. Remember you can't smell, see, or taste CO. Might take 20-30 minutes to reach that point. When the coals are ready, that's when you move the bbq into the tent. The smaller the tent the better. You need to generate more CO than what is escaping from the tent. Don't skimp on sealing the tent. Seal seams with caulk. Cheap caulk is fine. Make sure tent has attached floor. But cheap plastic bags, but them in half, and duct tape to the inside of the tent. You need to stop as much CO from escaping through the fabric as possible. When you place the bbq in the tent, let the CO build up before you get into it. Practice getting into the tent as fast as you can and getting the flap closed and zipped and sealed so as not to lose too much CO.
I said doing it this way (unrehearsed) was a gamble, right? Why? Because if you don't generate enough CO to kill yourself, then all you will succeed in doing is seriously injuring, and possibly maiming, yourself for the rest of your life should you survive. Maybe to the point of being so injured that you will have to be fed by someone else, have your ass wiped by someone else, and never be able to attempt another ctb in order to get yourself out of this new hell that you find yourself in. I'm not trying to scare you. I'm just telling you what it is. CO is my method, too, and how I will be exiting. But, I am going to conduct testing to make sure I can get the level of CO high enough in my tent on a repeatable basis. I'll be measuring CO levels with a meter. I don't want to fail. I cannot afford a failure. CO needs to be a
one and done method. If it's not a one and done method, there can be serious consequences.
Here endeth the lesson. Good luck to you if you do this. And may you find your peace.
CO Megathread
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