日韩欧美性视频 I 成年免费在线观看 I avgle成人网 I 韩国三级黄色毛片 I 在线看免费无码av天堂 I 九色综合狠狠综合久久 I 性暴力猛交暴力视频网 I 国产一区二区三区乱码在线观看 I 操人视频免费 I 国产精品久久久久久久久久久久冷 I 国产三级精品三级在线专区 I 欧美一级在线视频 I 久久99免费 I 国内精品久久久久影院嫩草 I 最新成年女人毛片免费基地 I 亚洲一区二区三区偷拍女厕 I 四色网址 I 免费无码又爽又刺激网站 I 日韩色图在线观看 I 蜜桃臀av在线 I 97超碰人人爱香蕉精品 I 国产99久久久国产 I 亚洲综合在线免费 I 久久强奷乱码老熟女网站 I 激情自拍av I 成全世界免费高清观看 I 青娱乐在线视频盛宴 I 黄色资源在线播放 I 日韩女女同性aa女同 I 亚洲精品久久一区二区三区四区 I 国产片黄色 I 色125综合网 I 色播激情五月 I av在线亚洲外国片 I 国产女人18毛片水18精品

　　Here is an introduction to the installation rules of the negative pressure fan:

　　After the installation of the negative pressure fan is completed, check whether there are tools and sundries inside the fan; check whether the fan blades are too tight or scratched, and the omissions can be ruled out before trial operation. Before installation, check whether the fan is intact or not. If any parts are loose or fall off, please do not install it.

　　When the negative pressure fan is running, if the fan vibrates or the motor has an abnormal sound of "humming" or other abnormal phenomena, it should be shut down immediately for inspection or consulted, and the abnormality should be eliminated before starting to use. Pay attention to maintaining the horizontal position of the negative pressure fan and avoid tilting.

　　The adjusting bolt of the negative pressure fan should be in a convenient position to adjust the belt tightness in the future. If equipped with a frequency converter, the switch of the fan should be operated normally according to the requirements of the frequency converter to avoid affecting the life of the fan.

　　The above is about the installation rules of the negative pressure fan. I hope you can understand it. For more information, please log in: www.dlyunfeng.cn