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I don't do duct work for a living but I have done quite a lot of it, If you want to branch off do not use a T fitting, will add a lot of restriction, the WYE will flow better. Are you changing the actual length of the run by anything or just altering how it gets there? If overall length is close it should be fine, if you are adding length use hard pipe as much as you can it should flow better then flex, and try to keep the diameter of the pipe at least as large as it is now, larger diameter helps keep the flow, when you restrict it the air will just find the path of lest resistance, unlike what some people believe.
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Last edited by 908/930; 06-27-2021 at 03:25 PM..
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