Note that the length assumes
the fused switch serving the heater is sited external to the guard.
If the isolator is internal to the guard, then the guard will
need to be longer.
ACCESS PANELS
Hinged, lockable, access panels are provided as as and when required,
in the most suitable position for controls access. This is normally
in the front or side panel of the guard. Access in the top face
is unsuitable as this restricts heat flow.