Recommendations for duct heaters and duct heaters: duct heaters can heat both liquid and gas, while duct heaters are only limited to heating gas. The outlet temperature of duct heaters heating gas is up to 300 degrees, with fins inside to increase the heat dissipation area, the heating gas outlet of the duct heater can reach up to 700 degrees, the duct heater does not bear pressure, and the duct heater can achieve a maximum pressure of 15MPA Pressure, usually used for compressed air, places with high temperature requirements.