As long as the fiberglass is contained within an enclosure and clothed by material to prevent airborne fiberglass from escaping, you are okay. Fiberglass is non-toxic, but can irritate the skin or if inhaled, your respiratory system. If you have little kids that maybe poking around your bass traps, you might consider changing out the fiberglass with Rockwool, which is equalyl effective.
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If the room is finished you might want to build them in the garage or outside if possible. Wear a long sleeve shirt and a dust mask. Goggles would be appropriate if the wind is blowing.
You may want to check out different manufactures... Some fiberglass insulation has a nasty odor to it. When covered with drywall there is not any problem. In your case where it will be covered by a porous material good chance the smell would pass through.
I recently had fiberglass blown in my attic replacing 30 year old nasty stuff that floated in the air as a fine particulate. The new stuff they use is not as fiberous, shaped liked cheese curls, doesnt break down as easy. I still would cover it with fabric that got down to the 10 micron range. Might consider contacting your local insul installer for a couple of buckets of that stuff.
Alternatively you could use cellulose HomeDepot offers for blow in.
The most amusing post of the night :^).
I've contacted Richard from Rives Audio who shares the same opinion with you. You need to take safety measures when installing it and can be replaced by rockwool of the same density. He stated though that all acoustical treatment companies (RPG,ASC etc) use fiberglass in their products.
Fiberglass is through out your house as it is in most houses. Fiberglass is in or around your A/C or heating system. If your have an old system that is externally insolated it is done with standard insolation. If new and externally insolated it is again standard but if internal it is sealed. Most sound tubes and planks are also made with duct board not loose insolation for the most part and is less prone to seperation or flaking. You would have to take the covering off and play in it to bother it enough for it to get it into your lungs and by then your skin would be so itchy you would go out of your mind and your kids would only play with it once trust me.
I myself do not worry about it and I work with it or around it all the time.