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I intend ducting a cooker hood to the outside using 204mm x 60mm rectangular ducting. Looking at the ducting it has same problem as when I have used smaller size on other jobs the longer length sags a little ie is not a proper rectangle. And to my mind if one uses the standard connection bits this does not solve the sagging which must result in a more turbulent airflow at that point. I know one can get different connectors having seals at either end which will keep any sag to a minimum, has anybody used these?