Feature:
1.Passbox may be divided into standard type and biological clean type ( the latter equipped with air self-purification device)
2.Divided into mechanical and electronic interlocking types as per door interlocking forms
3.Divided into colorized steel plate, paint baked cold-rolled plate and complete stainless steel as per materials of its enclosure
4.Sizes of versatile ones are listed in the following list and special specifications are made as required by users 

 　
Item NO                     Dimensions                               Open means                                          Material
                                 inner            outer  
LPB-2-554     500X550X400 770X1300X460          mechanical linkage                          Stainless Steel
LPB-2-666     600X600X600 870X1400X660  
LPB-2-886     800X800X600 1027X1600X660       electronic interlocking                     Cold-roll Steel
LPB-2-8810   800X800X1000 1027X1600X1060