Long service life with special fully enclosed drum motor and practical, the operation is as smooth as any fan we encounter 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. Two-way stable design, long-term work is not afraid of shock.High-quality patch stamping, fixed and not afraid of vibration.