Lijan Greentech is Manufacturer, Supplier and Service Provider of Wind Turbo Roof Ventilator Fans. Good quality Roof Ventilator Fans does not have any maintenance requirement if properly installed. Basic Parameter of Ventilators is Capacity (Volume of Air discharged per unit time in cubic feet per hour (CFH) or other units). Normal Ventilators have capacity 170, 000 CFH. Capacity depends on Throat Area, Wind Velocity and Smoothness of Rotation.
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