Galvanized round duct, can I substitute flex aluminum for part of the run?


I would like to shift some galvanized 6 inch round duct in a joist space. I would like to splice in some 6 inch flex aluminum duct at each end so the duct could be shifted one way or the other for some hi-hat lights. Would doing so violate code or good practice?
Thank you for any help.
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andy everett wrote:

Bad practice in my opinion. No matter how you do it, it is going to case some additional restriction. To reduce the restriction and possible future problems, I suggest using a pair of elbows at each end.
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Joseph Meehan

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I would stick with galvanized. Flex aluminum will add some flow restriction if it's not completely expanded and look like a bad patch job. A couple six inch collars cut and crimped wouldn't be that hard.
Bill
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Hi Andy,
I doubt the restriction mentioned by others would really amount to much if you are just swooping around light fixtures. The drag induced by 4 elbows would probably be worse than that of the foil tube in a loop around the light fitting.
By a "loop" I mean, cut an 18" long piece out of the solid duct.
Attach one end of the flexible to it.
Run the flexible past the fixture, then do a full loop around the fixture and attach to the other end of the solid duct. Nice big radius and quite low restriction overall.
Dave
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