I apologize if this is an inappropriate post, but I’ve learned a lot reading this forum so I’d thought I’d ask. I’m having my local sheet metal shop make all my new ductwork, but money is a little tight so I’m making all the fittings, reducers, etc. Is there a formula figuring the length of reducer or just as long as it’s not to drastic? I’m a metal fabricator (unfortunately a laid off one) so I have a fairly decent ability to make everything, but we never really went thinner than 18ga at work.
source https://hvac-talk.com/vbb/showthread.php?2226018-Rule-of-thumb-for-reducer-length&goto=newpost
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