A special frame for assembly over an existing wooden or metal frame, without causing damage to the existing walls. The cover frame is made of 1.25-mm (0.049'')thick steel plate, coated with vinyl on one side, and galvanised on the other.

This frame is made of 1.5-mm (0.059'') thick galvanised steel'' and is mounted directly into the wall, usually during construction work, by cementing it to the walls of the building structure (*Also available with 1.25-mm (0.049'') thick steel sheet coated with vinyl on one side, and galvanised on the other). Upon completion of the construction work, the door can be hung onto the frame.