FD30 fire doors
FD30 means the door has been tested to resist fire for 30 minutes. The rating belongs to a complete assembly, not to the leaf alone: the frame, the intumescent seals, the hinges, the latch and any closer were tested together. Fit a certified leaf into an uncertified frame and the 30 minutes no longer means anything.
Fire doors are the one product on this site where getting it slightly wrong has a consequence that is not about looks or money. They are also the product most often bought as a leaf on its own and fitted with whatever hinges were in the van.
The rating is not a property of the door you are looking at. It is a property of the whole doorset, installed correctly.
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Prices are guide prices including VAT, taken from the smallest size and plainest finish of each door. They are not an offer to sell — confirm the price for your size and finish before ordering.
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What FD30 actually means
FD stands for fire door and the number is the minutes of fire resistance demonstrated under test — 30 for FD30, 60 for FD60. The performance being measured is integrity: how long the assembly holds back flame and hot gases. Leaves are typically 44mm thick for FD30 and 54mm for FD60, because the resistance comes from the density of the core.
The door is one part of a tested assembly
Every one of these was in the test, and every one of them has to be right on site:
- The leaf itself, uncut beyond its stated allowance.
- The frame or lining, of the correct material and section, correctly fixed and packed.
- Intumescent seals in the leaf or the frame, which expand in heat and close the gap.
- Hinges of the correct grade and number — fire doors normally take three, not two.
- The latch or lock, and its intumescent protection.
- A closer, where the door has to be self-closing.
- Any glazing, with the beads and glazing system it was tested with.
- The gaps around the leaf, which are specified rather than left to judgement.
FD30 or FD30S?
The S suffix means the assembly also restricts the passage of cold smoke, achieved with brush or fin smoke seals in addition to the intumescent. Smoke kills before fire does, so smoke sealing is required in a number of situations where a plain FD30 is not enough.
Which one your building needs is a regulatory judgement about the specific situation, not something to infer from a product page. [NEEDS HUMAN SIGN-OFF] — confirm the requirement with your building control body or a competent fire door installer before ordering.
Where fire doors are generally required in a home
In England the requirement comes from Approved Document B. The situations that come up most often in ordinary houses are the door between an integral garage and the house, doors between a stairway and habitable rooms in a three-storey home, and doors within flats and onto common areas. Loft conversions bring most houses into the three-storey category, which is why fire doors so often appear on a job that started as a bedroom in the roof.
[VERIFY: Approved Document B, current edition] and note that Scotland, Wales and Northern Ireland have their own technical standards. This is a summary to orient you, not a specification for your building — check with building control.