No electric motor, cable or switch: the unit runs on wind and hot air rise with zero electricity.
Cuts ongoing energy cost compared with powered exhaust fans for passive roof exhaust.
Turbine head spins naturally in light breeze, drawing warm air out without controls or wiring.
No motor means no electrical failure risk in damp or dusty roof spaces and no motor servicing.
Simple all-mechanical structure of head, blades, bearing and collar reduces wearing parts.
Helps balance indoor temperature and moisture passively for energy saving ventilation.
