Steel window frame assemblies of 0.125-inch (3.2 mm) minimum solid section or of not less than nominal 0.048-inch-thick (1.2 mm) formed sheet steel members fabricated by pressing, mitering, riveting, interlocking or welding and having provision for glazing with 1 / 4 -inch (6.4 mm) wired glass where securely installed in the building construction and glazed with 1 / 4 -inch (6.4 mm) labeled wired glass shall be deemed to meet the requirements for a 3 / 4 -hour fire window assembly. Wired glass panels shall conform to the size limitations set forth in Table 715.5.3.
TABLE 715.5.3 LIMITING SIZES OF WIRED GLASS PANELS
TABLE 715.5.3 LIMITING SIZES OF WIRED GLASS PANELS
| OPENING FIRE PROTECTION RATING | MAXIMUM AREA (square inches) | MAXIMUM HEIGHT (inches) | MAXIMUM WIDTH (inches) |
| 3 hours | 0 | 0 | 0 |
| 11/2-hour doors in exterior walls | 0 | 0 | 0 |
| 1 and 11/2 hours | 100 | 33 | 10 |
| 3/4 hour | 1,296 | 54 | 54 |
| 20 minutes | Not Limited | Not Limited | Not Limited |
| Fire window assemblies | 1,296 | 54 | 54 |
For SI: 1 inch = 25.4 mm, 1 square inch = 645.2 mm2.