| 52 / | HD | STATIC STRUCTURES (E.G., BUILDINGS) |
| 633 | DF | OPENWORK; E.G., TRUSS, TRELLIS, GRILLE, SCREEN, FRAME, OR REBAR CHAIR {12} |
| 656.1 | DF | .~ Outside corner or peripherally bordered (i.e., framing, etc.) {5} |
| 656.2 | DF | .~.~ Portal frame or closure frame {4} |
| 656.4 | | .~.~.~ For door |