[Mahler9th]

"For the record, if things go badly for me, I would rather have a functional vent than not be able to get access to a FDA approved vent."

I would want a functional vent used by people with some level of skill, experience and training people in a care setting that does not make the vent superfluous. So I guess my specs are different.

"The purpose of this thread is to develop something for use in an emergency situation, not something for used or sale on the open market in normal circumstances."

Sorry, I missed that post by the OP.