Ⅰ, stage Ⅱ fan assembly, Ⅰ, grade Ⅱ hub - face not less than 9mm; Main purpose and scope of application: Board Ventilator also applicable to other driving surface mine ventilation ventilation, and various occasions, local ventilation roadway tunnel ventilation. Board Ventilator manufacturers | pneumatic blower (Online) | Board Ventilator Co. provided by Zibo Blower. Zibo Blower Factory Co., Ltd. (www.zibo-fengji.com) is a professional "fans, mine fan, mine fan, explosion-proof fan, heat fan, boiler fan" of the company. Since its inception, we adhere to the "good faith, sound management" approach, the courage of healthy competition in the market, so that the "cloud laugh" brand has a good reputation. We adhere to the "service first, customer first" principle, so that the congregation Zibo Blower won the trust of customers in fan, ventilation equipment, and establish a good corporate image. Special Note: This information is for reference only pictures and information, please contact us to obtain the most accurate information, thank you!