Can I touch the metal frame or do I need to ground it?
It's class 1.


  With Class 1 appliances, the user is protected by a combination of basic insulation and the provision of an earth connection, thus providing two levels of protection. When PAT Testing Class 1 appliances, Earth Continuity and Insulation Resistance tests are carried out.
  (source)


It needs a ground connection on the metalwork. There should be a grounding screw there somewhere.