... One/two-way, plastic/iron are available Product Name: Exhaust Fan with Shutter and CoverSpecifications: 1) Use for: office, living room, department store ... ,hotel and so on., 2) Size: 6", 8'', 10'', 12''3) ... : 50Hz 5) Material: Full plastic and plastic with metal base can be choosen 6)Packing: Standard export carton Exhaust Fan with Shutter and Cover