It is typically installed at high elevation, just below the greenhouse roof. The constant airflow created by the fan inhibits the growth of harmful fungi and bacteria by reducing stagnant air pockets.
Additionally, the circulation fan supports the performance of the main ventilation systems by compensating for pressure drops, thereby enhancing the efficiency of both cooling systems (such as pad and fan systems or evaporative coolers) and heating units (such as fan heaters and jet heaters).
- In winter, when the main exhaust fans are usually turned off, warm air rises due to its lower density and accumulates near the ceiling. Since air temperature is most critical at lower and mid-levels in the greenhouse, temperature sensors are typically installed at those heights. As a result, the accumulation of heat near the ceiling causes sensors to delay signaling the heating system to shut off, leading to unnecessary fuel consumption. By installing a circulation fan at a higher elevation, the trapped warm air is redistributed downward, improving thermal efficiency and reducing heating costs.
- In summer, when main ventilation systems are operating at full capacity, hot air buildup beneath the roof can interfere with airflow, creating a stuffy and overly humid environment. Using a circulation fan in this scenario helps rapidly evacuate the trapped heat, enhancing the overall performance of ventilation systems and maintaining a more stable climate.
Benefits of Using a Circulation Fan in Greenhouses:
- Uniform temperature distribution throughout the greenhouse and prevention of heat accumulation in specific zones
- Reduction of internal temperature and support for the cooling system
- Prevention of disease spread and improvement of plant transpiration
- Enhanced plant respiration due to improved air circulation
- Faster air exchange during warm seasons
- Better heat distribution when using warm air heaters in winter
- Improved humidity distribution when combined with fogging, misting, or humidification systems
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