... :4" to 60" stander length:5m or 10m4,Main color: black, orange ect.5,Character: enduring high temparature,acid,alkali,oleic ... points of high dense,durable abrasion and corrode.anti-static,low wind resistance,strong anti-pressure from 3000pa-5000pa.Temperature range:from -15 ... can conveniently connect to the portable ventilator to use together. black anti-static flexible ventilator ducting