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Each Sunglo Greenhouse model is equipped with an exhaust fan that can be upgraded to obtain the ideal climate for your plants. The exhaust fan is controlled by a thermostat that synchronizes it with the shutter to open at the same time. The fan is responsible for expelling used hot air through the top of the greenhouse while the shutter takes in fresh cool air near the bottom of the greenhouse to allow for the best possible circulation.
You can purchase additional Exhaust Fans for additional airflow.