Question-and-Answer Resource for the Building Energy Modeling Community
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You will find the earth tube option at the bottom of the HVAC tab. I've seen passive roof ventilators modelled to enhance natural ventilation via both buoyancy and external wind pressure (Monodraught etc.), but I haven't see a wind-powered roof "turbine" ventilator. I'd suggest you raise a ticket on the DesignBuilder Support Desk here for guidance on that: https://support.designbuilder.co.uk/
