Great project ! I roamed your website and saw the fire test pack includes a venting valve but I don't see it on the 3D renders of the packs on sale. My armchair understanding is the test may not replicate what will happen with valve-less pack, may your share more infos on that?

Anyway I'll look into it when in need to expand/replace my bosch system. Kudos to your team to make the work more reparable :-)