A glazed fire doorset is a fire door with a factory-fitted fire-resistant vision panel — a configuration available across the FD30 to FD120 range, not a fire rating in its own right. The rating still comes from the tested doorset; glazing is simply one of the things that door was, or was not, tested to carry. The glass itself must be fire-resistant glazing proven as part of that specific doorset: ordinary annealed glass, and even standard impact-safety toughened or laminated glass, has no fire rating and must never be assumed to be fire-rated, because it can crack and fall out of the frame in the early stages of a fire. Fire-rated vision glazing gives integrity (E) only — it holds back flame and hot gases — unless the glass has been separately tested for insulation (EI), which additionally limits the heat radiated to the escape side; an integrity-only vision panel therefore gives a door no insulation performance.
A vision panel is a system, not just a pane, and the fire certificate covers the whole set: the named fire-resistant glass, the glazing beads that retain it, the intumescent glazing seal that swells to close the glass-to-bead gap, and the fixings — each at the type, size and centres proven by test. Change any one component for something 'similar' and the evidence no longer applies. Every glazed doorset we supply will be manufactured as a complete certified unit under a third-party scheme, with the aperture formed in the factory — or, where a certified leaf is converted, by a Licensed Fire Door Processor working within its own certification — never cut into a completed door on site, which weakens the core, prejudices fire performance and voids certification. At 60 minutes and above, glazing is best bought factory-complete, because the higher heat leaves far less margin around the pane.
There is no universal maximum glazed area for a fire door: the largest permitted aperture, its position, edge distances and the number of panels all come from that specific door's certified field of application and test evidence, and a figure proven on one door design can never be transferred to another — glazed area is also more restricted at FD90 and FD120 than at FD30. Whether a door should have a vision panel for visibility is a separate question from fire, driven by accessibility and workplace rules (Approved Document M and the Workplace Regulations) rather than the fire standard; where the two pull against each other you specify a door tested for a panel in the position you need rather than enlarging the aperture. We will confirm achievable glazed sizes, positions, glass type and hardware at enquiry against the certified field of application, with no site cutting of apertures, and deliver each doorset with its certification evidence and installation instructions aligned to BS 8214, ready for the fire door register and Regulation 38 handover.
Specification
| Configuration | Fire-rated vision panel factory-fitted to a certified fire doorset — a glazing configuration, not a fire rating; available FD30 to FD120 within the certified field of application |
| Fire performance of glazing | Integrity (E) only — resisting the passage of flame and hot gases — unless the glass is separately tested for insulation (EI), which additionally limits heat radiated to the unexposed face |
| Fire-resistant glass types | Wired, ceramic, modified toughened/borosilicate or intumescent laminated glass, as named in the doorset's test evidence; ordinary annealed or plain safety glass is never fire-rated |
| Glazing system | Fire-resistant glass, glazing beads, intumescent glazing seal and fixings tested together as one system; changing any component invalidates the evidence |
| Aperture formation | Formed in the factory, or by a Licensed Fire Door Processor when a certified leaf is converted; no site cutting of apertures |
| Maximum glazed area | No universal maximum — the largest aperture, its position, edge distances and number of panels come from that door's certified field of application; more restricted at FD90/FD120 |
| Fire resistance | 30 to 120 minutes' integrity (FD30-FD120; broadly E30-E120 under BS EN 13501-2), per the certified design |
| Testing route | BS 476-22 or BS EN 1634-1, classified to BS EN 13501-2 on the European route |
| Smoke variant | 's' cold smoke seal variant where smoke control is required (European smoke classes Sa/S200 on the EN route) |
| Visibility (separate requirement) | Vision panels for accessibility and visibility follow Approved Document M and the Workplace Regulations, not the fire standard; specified separately from the fire performance |
| Ironmongery | CE/UKCA-marked hardware within the certification scope: hinges to BS EN 1935, closers to BS EN 1154, compatible locks and latches |
| Third-party certification scheme | Published at launch |
| Lead times | Published at launch |
Typical applications
- Corridor and circulation doors where sightlines through the door aid safe movement
- Cross-corridor double-swing doors on traffic routes, where a vision panel is required under the Workplace Regulations
- School and college classroom and corridor doors
- Healthcare ward, department and consulting-room doors
- Office, meeting-room and reception doors where borrowed light or supervision is wanted
- Flat entrance and communal doors where a glazed vision panel falls within the certified field of application
Options
- FD30 to FD120 fire ratings with glazing within the certified field of application
- Integrity (E) fire-rated glazing as standard; insulating (EI) glazing where separately specified and tested
- Wired, ceramic, modified toughened/borosilicate or intumescent laminated fire glass per the certified design
- Single or multiple vision panels within the certified scope
- 's' cold smoke control variant
- Double-swing cross-corridor configurations within the certified scope
- Vision-panel positions specified to meet Approved Document M visibility zones where the certified design allows
- Veneer, laminate, paint-grade and primed finishes
- Self-closing devices to BS EN 1154, including options suited to lower opening forces
- BS 5499 'Fire door keep shut' signage
Not sure which rating you need?
See fire door ratings explained and FD30 vs FD60: which rating do you need? — or run the compliance checker to find your legal duties.
We will supply FD30 to FD120 glazed doorsets on their own or installed to BS 8214 with full handover evidence.
Fire door supply →Frequently asked questions
Can a fire door have a vision panel?
Yes — many fire doors have glazed vision panels, and they aid escape by letting people see fire, smoke and each other through the door. But a glazed fire door is a configuration, not a rating: the panel must use fire-resistant glass in the specific glazing system the door was tested with, and its size and position must fall within that door's certified field of application. It is not a free choice added on site.
Does the glass in a glazed fire door give insulation as well as fire resistance?
Not by itself. Most vision panels use integrity-only glass (broadly E under the European classification), which holds back flame and hot gases but can become very hot on the escape side. Insulation (EI) additionally limits the temperature rise on the unexposed face and requires glass separately tested and certified for it. An integrity-only vision panel gives a door no insulation performance, so where a specification calls for EI you need glazing with EI classification evidence rather than an assumption.
Is there a maximum size for a fire door vision panel?
There is no universal maximum. The largest permitted glazed area, the minimum edge distances and the number of panels come from that specific door's full-scale test evidence and field of application, and a figure proven on one door design cannot be transferred to another. Glazed area is also more restricted at FD90 and FD120 than at FD30, so we confirm what is achievable against the certified design at enquiry rather than working to a generic number found online.
Can you cut a new vision panel into an existing fire door?
Not on site as a DIY job. Cutting an aperture into a finished leaf weakens its core and prejudices fire performance, so it must be done under factory conditions or by a Licensed Fire Door Processor whose certification covers the exact door and aperture. Cutting one yourself takes the door outside its tested condition and voids its certification. Every glazed doorset we supply will have its aperture formed within the certification chain, with no site cutting of apertures.
Can I put ordinary glass in a fire door?
No. Ordinary annealed glass cracks and falls out of the frame in the early stages of a fire, and standard impact-safety toughened or laminated glass must never be assumed to be fire-rated either. Only glass fire-tested as part of that door's certified glazing system — held in the certified beads, seal and fixings — counts. Fitting anything else removes the door's fire performance and voids its certification.