Kitchen range hood ducting

[monp]

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?

 

[IRstuff]

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

 

[OscarMeier]

Is this for a home rangehood?

 

[monp]

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.

 

[monp]

Yes, this is a residential range hood

 

[lilliput1]

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

 

[monp]

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?