I wanted this to protect a very expensive 3.5" ceiling speaker in the master bathroom with insulation/loft upstairs. This cover rolls up like a bandsaw blade and fits a 3.5" hole. quite easy. It is very thin and does NOT fit like the photo. It hangs around the speaker but helps maintain isolation. Felt insulation becomes more difficult as this cover lacks structural integrity. Atlas basically makes a recessed lantern cover in various sizes of metal for about $25.
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