Two different fire-rated products
- Fire-protection-rated glazing is an opening protective. It meets the fire-protection and hose-stream requirements of NFPA 257 or UL 9 and may be used in fire window openings.
- Fire-resistance-rated glazing is the wall-equivalent product. Under IBC 2021 Section 703.4 it is tested to ASTM E119 or UL 263 and complies with Section 707.
Confusing the two is the listed common error. 16 CFR 1201 is the CPSC safety glazing impact standard, not a fire test, and NFRC 100 is not a fire test either.
The OH marking: IBC 2024 Section 716.1.2.2.2
Fire-protection-rated glazing is labeled OH — XXX.
- OH means the glazing meets both the fire-protection and hose-stream requirements of NFPA 257 or UL 9 and may be used in fire window openings. It does not stand for overhead or sloped glazing.
- XXX is the fire-protection rating in minutes. OH — 45 is 45 minutes, not 4.5 hours. OH — 60 is 60 minutes.
The marking says nothing about lite area or impact; impact is a 16 CFR 1201 matter tested at 150 or 400 ft-lb.
A lite marked OH — 60 is fire-protection-rated glazing; calling it fire-resistance-rated is wrong.
Labeling fire-resistance-rated glazing: IBC 2021 Section 703.4
It must bear a label marked in accordance with Table 716.1(1) issued by an agency and must be permanently identified on the glazing. Two traps follow:
- A removable label on the frame fails the permanent-marking rule. The mark belongs on the glass itself.
- Paperwork, such as a submittal or certificate, does not replace the label on the glass.
OH — XXX is the marking for fire-protection-rated glazing, not the marking for fire-resistance-rated glazing.
Quick sort
- Tested to NFPA 257 or UL 9, marked OH — XXX: fire-protection-rated, opening protective, fire windows
- Tested to ASTM E119 or UL 263, agency label per Table 716.1(1) permanent on the glass: fire-resistance-rated, wall-equivalent, Section 703.4
- Tested at 150 or 400 ft-lb: safety glazing under 16 CFR 1201