The use of high temperature air duct when the first to clear the temperature limit of the product, more than the product after the use of extreme temperature will cause the duct is not durable phenomenon. For example, 400 degrees high temperature duct ventilation refers to the instantaneous temperature of 450 degrees, often the temperature of about 400 degrees, so the temperature can not often use more than 450 degrees. If the duct in use when the product exceeds the limit temperature, often over the use of temperature range caused by the duct is not durable. Therefore, in the use of high temperature duct or other industrial hose must be maintained at the standard temperature, the moment to reach the maximum temperature can be, but can not often exceed the standard temperature in order to avoid causing duct breakage.

        High temperature telescopic duct should also pay attention to its use of pressure range, sub-positive pressure and negative pressure two, positive pressure duct is exhaust or ventilation use; negative pressure duct for ventilation use, negative pressure duct available In the ventilation exhaust and positive air duct for ventilation when the pressure is too large will lead to the phenomenon of pumping duct or pumping, so when used to distinguish between the out of the pumping or out row.