The work “hazard" is in common use in the English language and it must be defined here to show the context in which it is used hereafter.
A physical situation with a potential for human injury, damage to property, damage to the environment or some combination of these.
It can be seen from the definition that three distinct types of effect are considered but in some cases one hazard may lead to others. Fire, for example, can be a serious health hazard.
A hazardous substance:
A substance, which, by virtue of its chemical properties, constitutes a hazard.
Posted in Fans Ventilation A Practical Guide