I would suggest that you look at the disabled toilet locks used in Tesco and
Homebase stores. It's a bit difficult to describe, but has a large lever (at
least 4" or 100mm long) which slots into a plate on the door frame. I'll get
a photo of it, and post it on here. I'm afraid I'm very sceptical of
equipment that Architects specify, as I am aware that they are inclined to
choose things which are very difficult to track down replacements for if
they fail. I would be much inclined to ask the Architect, why they have
chosen a non-standard product, and what major advantage this product has
over what is usually supplied. Arhitects seem to prefer specifying items for
reasons of 'style' rather than functionality!
As for how one unlocks these and many others from the outside, if they are
properly designed, the Red/Green signal dial on the outside, has a slot in
the middle of it, which can be turned via a key or large coin, to gain access.
Many disabled toilets also have an alarm pull which signals somewhere which
is regularly manned in case the person inside the toilet, needs emergency
assistance.
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