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

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Galvanized round duct, can I substitute flex aluminum for part of the run? andy everett 01-19-2007
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Posted by andy everett on January 19, 2007, 1:14 pm


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.

Posted by Joseph Meehan on January 19, 2007, 2:23 pm


andy everett wrote:
> 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.

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.


--
Joseph Meehan

Dia 's Muire duit




Posted by Berkshire Bill on January 19, 2007, 5:31 pm



>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.

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



Posted by Dave, I can't do that on January 19, 2007, 5:50 pm


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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