I have a 1500 sq house, 2.5 ton ac. 7 runs. Bedroom is 250 sq addition with original 1970’s round metal ducts. I want upgrade to flex, trying to figure out the right sizing. I believe I need an 8 inch flex duct for bedroom, but do I branch this off a trunk or run directly off plunum? I think I go off a trunk but if so what size trunk do I use?
Thank you
Thank you
source https://hvac-talk.com/vbb/threads/2241438-Trunk-and-Flex-branches?goto=newpost
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