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Message: <blockquote data-quote="Squatting Dog" data-source="post: 137281" data-attributes="member: 1688">That is why I am concerned about the weld on the inside of the tube. Ideally, you would want it as smooth as possible to keep airstream flowing smooth as possible. With sloppy welding could cause disturbance in airflow (eddies and turbulent vortices) and slowing it down. Allowing some heat gain because of heat transfer from tube and molecular friction caused by turbulent flow. -Greg</blockquote>