1. Outside SECC steel, fine powder coating treatment; Inner SUS#304 stainless steel. 2. Use new high temperature resistant long shaft motor 3 Turbine fan. 4. Silicone forced tight 5. Overtemperature protection, super load automatic power system. 6. Circulation system: air force level cycle. 7. Heating system: PID+S.S.R. 8. The thermostat: PID microcomputer control, automatic constant temperature, temperature quickly compensation function 9. Timer: temperature to time, when the power failure alarm indication. 10. According to customer demand matching glass window can be customized according to customer specifications specified.