Environmentally friendly and non-polluting, it is perfect for planting room ventilation or in combination with carbon filters to control odour. Description: Powerful and efficient performance, high speed silent saving.High quality fan blades are and powerful over plastic fan blades. Long service life with special fully enclosed drum motor and practical, the operation is as smooth as any fan we encounter Two-way stable design, long-term work is not afraid of shock.High-quality patch stamping, fixed and not afraid of vibration.