GPS DM-S, Руководство по установке

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Alternative Fastener Installation
Use #6 X 1” self-piercing sheetmetal screws.
Install fasteners in locations shown below.
Once secured, continue at Step 4 of ‘Standard Installation’ to complete.
If duct surface is irregular and the DM-S does not form an adequate seal, additional fasteners may be used.
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4.5”