Agilent Technologies 7890A GC Safety Manual page 6

The insulation around the inlets, detectors, valve box, and the insulation cups is
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made of refractory ceramic fibers. To avoid inhaling fiber particles, we recommend
the following safety procedures: ventilate your work area; wear long sleeves,
gloves, safety glasses, and a disposable dust/mist respirator; dispose of insulation
in a sealed plastic bag; wash your hands with mild soap and cold water after
handling the insulation.
Oven thermal leaks
Objects passing through the oven door seal can cause thermal leaks which create
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hazardous hot spots which cause burns and melt equipment.
Do not allow wiring or temperature probes to pass through the oven door jam.
Agilent recommends using one of the access holes.
6 7890A GC Safety Manual