Mitsubishi Electric CAHV-R450YA-HPB Installation & Operation Manual page 46

<2> Installing the conduit tube
• Punch out the knockout hole for wire routing at the bottom of the front
panel with a hammer.
• When putting wires through knockout holes without protecting them
with a conduit tube, deburr the holes and protect the wires with
protective tape.
• If damage from animals is a concern, use a conduit tube to narrow the
opening.
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Knockout hole
Burr