Isn't the plan to have a vent tube leading to the outside of the hull ?
Is that a very unique penetration of the pressurized hull? Presumably heavy (lest it rupture under pressure of the energy being released in the box), potentially very hot, relatively long and rigid. Ample opportunity for vibration?
Changing topic quickly: it would be interesting if a third-party STC'ed a replacement using e.g. one of the newer, safer Lithium variants.