Full Slip Frames for doors are also made to fit an existing frame opening without removing the old frame. The critical dimension on these frame is the throat – which is equal to the jamb width of the existing frame that is being covered. The faces and stop dimensions can be modified as required.
These frames are shipped out KD units that can be inserted into the opening, then fastened into place with screws on the faces of the jambs and head. Karpen Steel can punch the screw holes in advance, or they can be drilled in the field during installation.
Using this frame allows all hardware preps with sufficient room for hinge and strike reinforcements.