Webasto HL 90 Notice D'utilisation Et D'entretien page 19

The heater must not be operated:
GB
Danger of fire, explosion and
suffocation
18
In filling stations and tank farms.
In places where explosive vapours or dust may
build up (e.g. near fuel, coal, wood dust or cereal
stores).
Close to inflammable materials such as: Dry
grass and leaves, cardboard packaging, paper,
etc.
In enclosed rooms (e.g. garages), not even via
the timer or Telestart.
For heating compartments in which hazardous
goods are transported.
Without an additional shield over the heat
exchanger to prevent people or flammable
materials touching the surface of the heater
inadvertently.