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Pg 34 states that gear/protective systems "...stack for that vector"
- Ok, that makes sense. A Tracheal filter and filter mask would both apply for inhaled vector toxins, so they stack.
So that's all good, but I don't think that answers the question that was asked (and is written right above it).
The question asked about a character has "gear that protect against different vectors"
So if a guy with a tracheal filter and respirator was hit with nausea gas (inhalation only) he would stack those protections.
If the same guy was hit with Neuro stun (Inhalation and Contact vectors) and doesn't have protection against contact how does that work? I think that's the essence of the question, and quite relevant given that (contact + inhalation) is super common.
It's worth pointing out that I think the answer to the immunity question (pg 33) got it just right. The guy with a Gas mask (immunity to inhalation) but no chemical seal (contact immunity) is going to take the full brunt of Neuro Stun, cuz its' the good stuff (Contact + inhalation). In the same manner, I think any toxin should only be resisted by the *least* resisted vector as far as protective gear goes. Characters should not be able to stack protection from different vectors.