Protection Class Symbol and Using Area

IP20 Dry Living Cabin and dry control room
IP22 Sterring room, Refrigeator toom, emergency engine room, store room
IP34 Engine Room, boile room, steering gea room and aux machinery room
IP44 Bath roo, Machienry space, gallery and laundry
IP55 Engine room 
IP56/IP66/IP67 Open Deck
IP68 Waterh deck and 20M underwater