To insure proper door and frame function, the clearance between the door and frame must be properly
maintained. All standard steel door and frame manufacturers closely hold tolerances that result in a nominal
clearance between the door and frame of 1/8 inch. If this clearance is not maintained, interference and hardware
misalignment will occur.
Proper installation is extremely important in establishing clearances and preventing a multitude of potential
The Steel Door Institute has many publications which were developed to establish industry standards and
assist in specifying as well as installing standard steel doors and frames. One publication, ANSI/SDI 250.11,
Recommended Erection Instructions for Steel Frames, will be of assistance regarding the erection and installation of
standard steel frames.