Some confined spaces are identify, eg enclosures with limited
openings:
■ storage tanks;
■ silos;
■ reaction vessels;
■ enclosed drains;
■ sewers.
Others may be less obvious, but can be equally dangerous, for example:
■ open-topped chambers;
■ vats;
■ combustion chambers in furnaces etc;
■ ductwork;
■ unventilated or poorly ventilated rooms.
It is not possible to provide a comprehensive list of confined