Baghouse operating temperature is an important basis for the design, the use of temperature and design temperature deviation will lead to serious consequences, because the temperature is subject to the following two conditions are constrained: First, different filter materials permitted maximum temperature (allows instantaneous temperature and long-term operating temperature) are strictly limited; the second is to prevent condensation, the gas temperature must be maintained above the dew point of 20 ℃. High temperature gas must be cooled to a temperature below the filter can withstand the cooling ways, more typical of natural cooling duct, forced air cooling, water cooling, according to the specific technology and different cooling temperature, arrangement size requirements for design selection.