In reality, lost out on a government job wiring g.i. barracks in southern cali. because the whole place, including air ducts were made of iber glass. told them we only need to drill a small whole to penetrate in to rooms. was told it would take an act of congress and a mighty expensive team of handlers to even touch the walls. check with osha they'll give you the correct answer or just do it and see what happens. if you knew it and you do it, who ya gonna call?!!!! Later Mike M.
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