... type(03 step control) -slim and beautiful designe -CE Certificate. AIR CURTAINAppliance:-commercial usag: general store,supermarket,department store,the entrence ... of freezer or refrigenators,factory assembly line,storage space,and automatic driver line,the place of garbage incineration,etc.Modle :BAC ... -2S BAC-120/1000-2Swelcome to contact me , buyer first . air curtain