(4" - 100mm Extractor Fan：. 5" - 125mm Extractor Fan：. 6" - 150mm Extractor Fan：. 4)this Hon&Guan ventilation suits for HVAC, Bathroom, Greenhouse, Grow room and Tent and so on. Frequency: 50HZ. Flexible Ducting Dryer Vent Pipe Aluminum Foil PVC Duct Fan Hose ：.
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