久久99热这里只有精品首页,成人精品中文字幕在线视频,国产精品久999,久久久久久久久午夜精品福利,国产夫妻自拍小视频在线观看,欧美激情一级大片,成人免费资源一区二区,日韩av电影在线观看,亚洲av日韩av鸥美

Use and maintenance of catalytic silencer
1. The selection of catalytic muffler must be matched with the air volume of the fan. The applicable air volume of the muffler should not be less than the rated air volume of the fan.
2, through the medium can not contain corrosive substances, water and oil fog, dust content should be less than 150mg/m3 (standard).
3, the installation should be equipped with a strong enough support, and vibration prevention measures, and the connection between the muffler and the fan should be added elastic pad.
4, muffler strictly prevent rain, foreign bodies into.