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The NFPA National Fuel Gas Code Handbook (even though I generally dislike the NFPA because they are principally marketer's of their multitudes of publications) is an excellent book to learn about residential and light commercial venting, as well as many other need-to-know basics.
The editor, Mr. Lemoff, has probably been since fired because of the recognition he was getting describing "trade secrets".
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Who is so ignorant as not to know that knights-errant are beyond all jurisdiction, their only law their swords, while their charter is their mettle and their will is their decrees? Don Quixote