A greenhouse fan not only provides the ventilation but also the correct air circulation in your greenhouse. Heat & humidity must be evenly distributed in the greenhouse so that your plants can dry off optimally. Above all, cacti, orchids & other tropical plants depend on the simulation of air movement to which they are accustomed in their natural habitats. Some plants, such as tomatoes, also require air circulation for fertilization. A greenhouse fan also protects your plants from pest & fungal attacks. Our greenhouse fan Arizona achieves a high fan performance of 460m 3 & is still very quiet. The stainless steel housing is attached to the ceiling so that the greenhouse fan can be used to save space. Made in Germany. 3 year warranty.