Answers to your queries 3,4, and 5 are all readily available on the web. In fact an answer to one of those points was avaiable long before the www. In 1896 in fact, so perhaps you should read a bit more. The answers to 1 and 2 perhaps you should discover by reading Bill Kininmonth's book. He is a denialist so you will like him, but beware you read it with a bit of background as even at the launch of his book there was a warning about it. He does go heavily into air circulation. Be careful to sit as you read it, because if you are in a closed room, you will need to have your nose at the right level to breath the oxygen strata. Too, high, and you will just get H of course. Sheese!
