The vent hood's ducting keeps coming off

The Ariston kitchen vent hood that I installed may have been installed according to the instructions (with the metal ring thing), but it keeps coming loose when in use.

Do you know how to secure this?

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It is best to use a solid, smooth aluminum pipe, as mentioned by the previous poster. A bigger diameter is preferable. Aluminum tape and a few screws will hold it in place. If you need to turn it to reach your exhaust, use an adjustable elbow. If you must make a horizontal run, make sure the pipe slants down slightly toward the hood. Any condensed grease will be able to return to the hood in this way.

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@Keller Much appreciated.

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Use of that type of vent duct is not advised. The ducting must to be sturdy and have a smooth interior surface. That will only gather gunk. The ridges also considerably reduce airflow.

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@Kristen I appreciate your help, but what about the detachment issue? Will that issue be resolved by the solid ducting alone?

@Kristen And if you could, which specific variety would you suggest? because rather than going straight up, my ducting makes a 90-degree angle to the side.