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Fans & Air Blowers
Air circulation in your greenhouse is critical if you want your plants to remain healthy. When air is stagnant, humidity builds up, plant diseases thrive (such as mildew) and plant stems don't become as strong as they do when air movement is more vigorous. A combination of fans and greenhouse vents will both help to main healthy air circulation.
Excessive high temperatures within a greenhouse is equally as damaging to your plants Air Blowers are generally more powerful than circulatory fans and when used in conjuction with greenhouse vents are a means to reduce those harmful high temperatures.