Vicoustic Wall/Ceiling Flat Panel VMT with Concrete, Pattern 1 (46.85 x 23.43 x 0.787", 8-Pack) - Manual (Page 5)

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Start the installation from the bottom-right side (If cuted panels
are going to be used it is recommended to start with these). Check if
panels are leveled before proceding to next row.
Glue the Velcro tape in the wall. It is recommended to use
2 stripes of Velcro per panel (included). You can also glue the panels
directly to the wall with Flexi Glue Ultra
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