Petiole holes on each blade and hub are fixed one to one relationship between K45-10 # main fan, if you need to remove it from the blade hub, it must be well marked in advance. When reinstalling to "condemnation." If disrupted the original positional relationship, the general balance correction should be done. K45-9 # main fan | Zibo Blower (certified) | Main Fan by Zibo Blower Factory Co., Ltd. Zibo Blower Factory Co., Ltd. (www.zibo-fengji.com) is a professional "fans, fans of mine, mine fans, explosion-proof fans, high temperature fans, boiler fans," 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, customers first" principle, so that the congregation Zibo Blower won the trust of customers in the fan, ventilation equipment, and establish a good corporate image. Special Note: This information is for reference pictures and information, please contact us to obtain the most accurate information, thank you!