These things have been around for 60+ years that I can track. My father noted them in his book about boilers in the 1960's which meant they were around since the 50s.
finding 'hard numbers' from one type to another is going to depend on which company you talk to - since in essence....they are salesmen!
To Turbulize or not
- Bill Shields
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Re: To Turbulize or not
Too many things going on to bother listing them.