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10
3. Cutting into duct
a. Drill a hole large enough on one of the corners of the outline as a starting
point to cut out the opening in the duct for the unit to be installed. Ensure that
the drill hole is made within the perimeter traced in step 2d as to not leave a
gap once the unit is installed.
b. Using the sheet metal snips (or appropriate cutting device), carefully follow
the trace, slowly cutting out the opening where the unit is to be installed
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