产品规格（Product Specifications）：
内径Inner Dia. 38mm～300 mm
产品说明：
由铝质通风管及不锈钢接头压制而成，具有安装轻便灵活，可随意摆动位置，长度伸缩自由，接口容易固定等特点。适用热水器、排风扇、工业除尘等设备通风管道。
Product Features:
This product is pressed by aluminum vent pipe and stainless joint, featuring easy and convenient installation, free change of position, telescopic length, and easy fixing of joint. It is suitable for using as the vent pipe for water heater, exhaust fan and industrial dust precipitation ， etc.