Dear Mr Rawles:
A follow-up to my last letter: Spiez is where the Swiss have their federal testing lab for Civil Defense. The lab has an english version of its website. At this link [1] your readers may acess the list of tested and aprooved components ( for CD shelters) and in a seperate document, the list of aprooval holders. Interested readers can then with a search engine find the companies who make components of interest one of which is Lunor. This company also has an English version of their web site [2]. Readers can from there select blast doors, NBC filters, valves etc. Spiez is also the home of the Swiss level 4 confinement lab, ( of which a few pictures can also be found on the lab website).
Beste grussen und danke ein andere mal. – Jason L.