... certificate JCD series high-grade type heavy hammer exhaust fan features.1. Certificate, CE.2. Frame, all the frames are made of ... , thickness 2.8mm.9. Electrical motor, national-grade aluminum alloy frame motor, 380V, 1.1KW, 50Hz, 3-phase, 4-pole speed ... .5mm thickness. Galvanizing layer , 160kg/m2.14. Opening system, heavy hammer.15. Rivets, aluminum alloy and stainless steel rivets.16. Cable ...