nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqa70vh79juh2xq8uvg4lcxyr8dn7e5un5s86r9dvpgpxh5tqhd6kqx9k56a (nprofile…k56a)
Not that it changes your central point, but my current impression is all isolation systems are inherently approximate, and that not only is there always a leak from interior to exterior (or sometimes opposite) in theory, but indeed such leaks can almost always be picked up in practice -- perhaps with certain inconvience, but never requiring really extraordinary means.
But I don't follow these things closely/regularly. Just now and again.