(2) Glazing and glass kit/glass beads are intact and securely fastened.

(2) Glazing and glass kit/glass beads are intact and securely fastened.

Glazing used in fire door assemblies must meet the door or frame manufacturer’s requirements for fire resistance, and may also need to be impact-resistant depending on the building code in use.  Glazing must be installed in labeled glass light kits or glass beads that are acceptable per the manufacturer’s listings, and must be installed in accordance with the manufacturer’s installation instructions.

Doors which are labeled for 3 hours are typically limited to 100 square inches of glazing.  Other fire doors may have the maximum glazing allowed by the manufacturer’s listings.

Glass LabelEach glazing unit must have a label that is visible after installation, which includes the location where the glass is used (Door, Opening, or Wall), whether the glass has met the hose stream test (H-required for 45 minute label or greater or NH-allowed for 20-minute label only), whether the glass meets the temperature rise criteria (T or NT), and the fire protection rating period (20, 45, 60, 90, or 180 minutes).  The label may include additional information about the product and manufacturer. Viewers (peepholes) used in fire doors must also be labeled.

Source: NFPA 80 2007, 2010 – 4.4

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