OVERSIZED
STEEL FIRE
DOORS.
Non-standard dimensions. Fire resistant and non-fire resistant options. Single and double leaf. For warehousing, logistics, plant rooms, and industrial applications.
OS Range — Fire & Non-Fire Options
Source: ETA-22/0324 (revised May 2024, OiB Vienna, Notified Body 1322). Oversized doorsets are configured to project — classifications below describe the certified variants.
| Product | Configuration | Fire Classification | Smoke Classification |
|---|---|---|---|
| OS 60-1 | Single leaf · Fire | EI 60 | Sa4 / S200 |
| OS 60-2 | Double leaf · Fire | EI 60 | Sa4 / S200 |
| OS 00-1 | Single leaf · Non-fire | Non-fire · CE | — |
| OS 00-2 | Double leaf · Non-fire | Non-fire · CE | — |
Fire-resistant oversized doorsets are classified EI 60 to EN 13501-2 with Sa4/S200 smoke control. Non-fire oversized doorsets are CE marked as standard steel doors. Both variants are available in single and double leaf configurations sized per project opening.
- Warehousing
- Logistics
- Plant rooms
- Industrial units
- Data centres
Doorset parameters.
Oversized doorsets are configured to project opening. Parameters below are the certified envelope — confirm dimensions, finishes, and ironmongery per schedule.
- Maximum single leaf
- 1600 × 3500 mm — indicative, confirm per project
- Maximum double leaf
- 3200 × 3500 mm — indicative, confirm per project
- Leaf construction
- Reinforced double-skinned galvanised steel, mineral-wool core, internal bracing for oversized spans
- Frame
- Reinforced galvanised steel profile · factory-welded mitred corners · anchor pattern sized to leaf mass
- Acoustic (Rw)
- Up to 38 dB, dependent on configuration
- Hinges
- Heavy-duty steel hinges — count scales with leaf height and mass (typically 3–4 single, 6–8 double)
- Lock
- Mortice lock, multipoint option, cylinder to client profile
- Door closer
- Heavy-duty overhead closer, EN 1154 compliant · sized to leaf mass
- Glazing option
- Vision panel to EI rating · max 480 × 880 mm
- Finish
- Powder coat, full RAL palette · Corrosion class C3 (C5 optional, recommended for external non-fire)
Gap-fill and frame guidance.
Oversized doorsets carry significantly greater leaf mass — anchor pattern, embedment depth, and frame bracing are sized per project. A fire-rated OS doorset is only classified when installed within the conditions set out in the ETA and the project-specific installation schedule.
Supported substrates: masonry, reinforced concrete, and structural steel. Lifting plant is typically required for leaves above 2500 mm height. Intumescent and smoke-control seals on fire variants are factory-fitted and must not be removed or painted over.
Download installation manual →-
01
Verify the opening
Check structural opening against the dimensions and substrate noted on the order acknowledgement and ETA field of application.
-
02
Frame fixing
Fix frame with approved anchors at centres specified in the installation manual. Plumb, square, and packed to manufacturer tolerance.
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03
Gap-fill
Fill the perimeter gap with the specified intumescent mortar or mineral-wool product per the ETA field of application. No foam. No generic sealants.
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04
Commission and record
Hang leaf, test closing and latching, record DoP reference and installer sign-off for the Golden Thread file.
Evidence pack for the OS range.
Every document needed for specification, Gateway submission, and post-occupation record. Versioned and dated for the Golden Thread.
ETA-22/0324
European Technical Assessment. OiB Vienna (NB 1322). Revised May 2024.
Download PDF → DoPDeclaration of Performance
Per doorset. Issued on order confirmation. CE classification and essential characteristics.
Request DoP → DatasheetOS Range Technical Data Sheet
Full product parameters, dimension envelope, and configuration options for OS fire and non-fire variants.
Download PDF → InstallInstallation Manual
Frame fixing, gap-fill, ironmongery, and field-of-application rules.
Download PDF → NBSNBS Spec Clauses
Pre-written NBS clauses for the OS range — classifications, smoke ratings, ironmongery references.
Open NBS creator → EvidenceTest Reports
EN 1634-1 test reports from ITB, Efectis, KIWA, OiB, and RISE. Available on request.
Request reports →DFM DS doorsets are CE marked for internal applications under ETA-22/0324, issued by OiB Vienna (Notified Body 1322).
For external door applications, contact us to discuss current certification status before specifying.
Talk to the UK office →