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@gillies
i've got some rigid flat rectangular ducting that provides ventilation for my bathroom. It runs through the bathroom ceiling and into the adjacent room down the wall and into the floor and onwards.
I want to cut a hole in the section of ducting in the adjacent wall and fit a vent grille over it so that the room gets better moisture extraction - as it is where I often dry my clothes.
What's the best way to do this cleanly and without cracking the plastic - dremel rotary tool then velcro patches for the grille over the hole?