danger asphyxiation hazard do not enter permit-required confined space tag template label sign, , isolat

access area asphyxiate asphyxiation asthma atmospheric avoid background breathing carbon carcinogen chemical confined danger dust enter entry environment eps10 gas hazard health icon illustration industrial isolate label lung mask not permit permitrequired poison pollution protection protective required respirator restricted risk safety shield sign space sticker suffocation symbol tag template toxic vector white zone