Roof Extractors are driven fans mounted on top of the roof to air forcibly. The continuous expansion of indoor stale, hot and polluted air gives way to fresh air entering the enclosure thus maintaining healthy air quality exhaust indoors. Roof Extractors are good channel to extract air from localized place to reduce dust and heat spread in the workspace. A busy household can easily develop stale air from cooking, smoking, bathroom odors, dampness and a general lack of ventilation.
Roof Extractor is also used to the air outlet on the top of the building or shed.
Roof Extracor fans can be divided into two parts.
- Motorized roof exhaust fans
- Non-Motorized roof exhaust fans
Motorized roof fans are rotor directly coupled to the engine. These fans exhaust a large amount of air, regardless of the ambient wind speed of the external air. Various industries used it for extracting stale air.
Non-motorized roof ventilators operate on the principle of natural draft and return to the moving wind speed of the air. These are suitable for go downs and are not active in the production areas of the exhaust air volume is very less
Construction and Working:
The fan has cup-shaped aerodynamic for catching the air and forcing the same time on the lee side to ventilate any area continuously. Motors operate the Roof Extractor and the turbines while the turbines rotate as a result of applied energy from wind speed for the increase of centrifugal force of the wind. The effect produced here causes it to develop a low-pressure area, and this is responsible for the control of air from the turbine. Fresh air continuously replaces the pulled out of the air by the fans.
The Roof extractor works by exploiting the full speed of the wind energy, to create the air flow utilizing centrifugal force. During rotation, the centrifugal force created by the, draws the air in the turbine’s rotating blades and out of the turbine. The aerodynamic vanes act as cups catch the wind on the windward side of the turbine. At the same time air is forced out at the leeward create continuous airflow; leading to ventilation. In contrast to the doors and windows, roof which extractors driven by the wind, pulling the air upward, the creation of convection current and in the process, they get stale air, to air that is hot due to the exposure building.