| Label Verification | First, confirm that all UL or Intertek labels remain visible and readable. These labels verify the tested fire rating and are mandatory during inspections. Therefore, labels should never be painted over, altered, or removed, as this can invalidate compliance. |
| Gasket Inspection | Next, inspect intumescent seals for cracking, shrinkage, or displacement. Because these gaskets activate during heat exposure, even minor damage can reduce smoke-sealing performance. As a result, seals must remain intact and correctly seated at all times. |
| Closing Mechanism | If operable fire-rated windows include self-closing functions, test them regularly. In particular, fusible links and closers should engage smoothly and fully latch the window. Consequently, quarterly testing helps ensure automatic closure during fire conditions |
| Glass Clarity | Glass clarity also matters. Use only non-abrasive, pH-neutral cleaners to prevent surface damage. However, if fire-rated glass shows signs of clouding or delamination, performance may be compromised. In that case, replacement becomes necessary to maintain rated protection. |
| Frame Integrity | Finally, examine steel frames for dents, bends, or impact damage. Since the frame holds the glazing in place during fire exposure, any deformation can weaken the assembly. Therefore, damaged frames should be assessed promptly to preserve structural reliability. |