These door systems are fully welded and then clad in ridgidized stainless to provide a more durable surface.
This style of door system was first installed in the Barton Hill district of Bristol before being rolled out accross the city. All mullions, vertical and horizontal frame members are clad with "6WL" diamond pattern. The equipment housings from "9EH" Elephant Hide. This makes the surfaces more resistant to marking and staining helping to maintain a better appearance and keeping maintenance costs to a minimum.