Panasonic JB-3300 Technical Manual page 263

Handling Precautions
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The panel has a glass container. Extreme care must be
taken not to scratch, crack, or break the edges. Also
take special care with the vent tube that protrudes
from the rear of the glass container.
Install the unit with enough clearance to ensure good
ventilation.
Protect the display unit from impact and extreme
pressure.
Do not expose the display unit to strong electrostatic
charges.
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