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Dave,
This is from Armstrong: Clips
Several clip designs are available to suit applications such as fire resistance, wind uplift and impact. Fire-resistance rated designs have exact requirements, including the mandatory use of hold-down clips for acoustical panels or tiles weighing less than 4.9 kg/m2 (1.0 pound per square foot). For rooms with significant air pressure differential from adjacent spaces, retention clips may be necessary to retain panels in place.
I assume these should hold panels tight to the grid, eliminating rattle. No experience with them though.
David
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to quiet these annoying noises down ?
