It may or not be, depending on the situation. Just because something has fiberglass in it doesn't automatically make it hazardous. My point is that fiberglass is all around us: houses, sports equipment, cars, etc. And you can get air movement through these spaces, especially on windy days. In crawl spaces and attics the fiberglass is often exposed. The separation is not as solid as you might think. Stack them all the way up to the ceiling for the most absorption." Better still, they are commonly available and you don't even have to unpack them! Just leave the bales rolled up in their original plastic wrappers, and stuff them in and near the room corners wherever they'll fit. These bales are not expensive, and they can be stacked to fill very large spaces. PS - you don't have to believe just me - I just found this on Ethan Winer's site (he's pretty reliable on this subject): "Another great and inexpensive way to make a bass trap - if you have a lot of room - is to place bales of rolled up fluffy fiberglass in the room corners. Not directly the same as a domestic situation, of course, but the same principle applies. I worked a few stadium gigs once (only a few, because I hate working outside) and the gigantic sub arrays were always fenced off with crowd control barriers, because if you got too close, not only were you liable to instant hearing damage, but the sheer impact could stop your heart, or break your ribs. Many treatments are boxed behind 1/4" plywood sheets, etc. Believe me, LF penetrates micron-thick plastic wrap without even noticing. Click to expand.How do low frequency pressure waves pass through walls? If thin plastic was enough to stop them, then the world's soundproofing problems would be solved at a stroke.
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