Cyclone roof ventilators

Cyclone roof ventilators (whirlybird ventilators), these are roof-mounted ventilation devices that use wind and thermal movement to extract hot, stale, or humid air from buildings without requiring electricity.

Common uses
Industrial buildings: removes heat, fumes, and stale air
Warehouses: improves air circulation and reduces heat buildup
Workshops & factories: helps ventilate work areas
Agricultural buildings: assists with moisture and heat control
Commercial buildings: improves natural ventilation