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Kitchen range hood ducting

Kitchen range hood ducting

Kitchen range hood ducting

(OP)
I am replacing my range vent hood.  I need to use different duct adapters, and because of that the new vent hood will not mate up with the ductwork.  The ductwork already has a swiveling type elbow, so I can twist it to angle it correctly.  But duct length is a problem.  Duct pipe seems to come in standard lengths only.

This would be easy to fix with the semi-rigid aluminum duct, but obviously that is a bad idea with a cooking exhaust vent.

So sticking with rigid, sheet metal duct- is there any type of telescoping adapter that can make up or take up slack to fit?  

RE: Kitchen range hood ducting

Why is semi-rigid a bad idea?  

I've got exactly that going from my hood to the exhaust vent.  It's been in place for over 30 yrs with no apparent degradation.

TTFN

RE: Kitchen range hood ducting

Is this for a home rangehood?

RE: Kitchen range hood ducting

(OP)
I'm only guessing that semi-rigid isn't the right stuff.  I noticed that in new construction and remodeling, they use rigid sheet metal ducts for the kitchen, but for bathroom vents they use semi-rigid.  I figure they would have used semi-rigid everywhere if they could.

RE: Kitchen range hood ducting

(OP)
Yes, this is a residential range hood

RE: Kitchen range hood ducting

Can you blank off the hood opening & provide a new opening lined up with the ductwork.

RE: Kitchen range hood ducting

(OP)
There is already a swivel fitting on the duct, I am all set as far as lining up goes.  My problem is how to deal with an odd length of rigid duct.  I suppose I could get a longer piece and cut it down to the size needed?

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