... ,1500mm,1800mm,2100mm,2400mm hot air curtains 1,Cross-flow type,Natural wind and PTC heating wind dual application,CE GS approved.With ... and corrosion resistance, and easy for cleaning and maintenance. Elegant design without any screws. 3,PTC heating element is with safe non ... thermostat , 60 seconds delay power off to protect the PTC elements. 4, Fan made in high quality ABS with toughness intensified ...