With regard to the window getting sandblasted, I have gone to a different solution. I just let it get blasted. The plastic frostshields to protect it run about $3 each, and get sand etched rather quickly. Instead, I just replace the glass every few months. Princess used to have them for just $8 each. I had a small stack of them, although I also notice that princess seems to have quit stocking the replacement glass.
WRT the air exhaust, there are actually two ports on the cabinet. The one on the left would be for fresh air intake, while the one at the back of the cabinet will be for exhaust. I used to use a modified fan for the exhausting, but the dust was destroying the fan annually. Without the negative air pressure, you will not see anything.
WRT all the various environmentally friendly and health conscious blast media, the problem with any of it is that the end result of blasting adds things like the lead based paint, rust, possible asbestos, and whatever else is present on the item being sandblasted. So in the end, anything used must be considered toxic. Maybe just less toxic. With a good vent fan on your cabinet, you will have no need for masks or supplied breathing air. The cabinet will be in a state of negative pressure, so nothing will escape it.
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