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ducting in roof cavity 4

https://atomic-wiki.win/index.php/Achieving_Whole-Home_Temperature_Control_with_Ducted_Reverse_Cycle_Systems

Running ducting in a roof cavity involves snaking flexible or rigid ducts through the space between the ceiling and the roof, often to connect an exhaust fan, rangehood, or bathroom vent to the outside. It's a tight, awkward job because you're usually kneeling on ceiling joists in the dark, trying not to crush the insulation while ensuring the duct runs straight and doesn't kink. You can't just shove it in—each bend reduces airflow, so planning a smooth route is key. The last thing you want is…