Crittal Windows is a UK based manufacturer. Their website no longer shows any US or Canadian presence except for a US flag.
http://www.crittall-windows.com/
I emailed them and their response was:
"We manufacture in the UK and export to the US on a weekly basis through approved US distributors."
The link to their US contractors is:
https://www.crittall-windows.com/home-owners/installers/