Did you check all the filters?
There is a foam sponge like thing typically on the out side, then a fine filter on the inside and often as well a bio filter just before the it goes out of the cabinet and that one can get clogged after years of use.
The bio filter keeps the machine from sending any bacteria to patients with respiratory illness but most of us lampworkers never think about that specific filter.
At least that is what I have seen on the machines I have worked on.
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The Zombie Apocalypse is Upon Us.
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