| Building / damper type | Interval | Reference |
|---|---|---|
| Offices, retail, hotels (electric/motorised) | 12 months | BS 9999 |
| Spring-operated curtain dampers | 6 months | BS 9999 + manufacturer |
| Healthcare estates | 6 months | HTM 03-01 |
| Data centres, custodial, transport | 6 months | Insurer / FRA |
| Smoke control dampers | 6 months | BS 9991 / BS 7346-8 |
| After building works affecting ductwork | Before re-occupation | RRO 2005 |
| After a fire event in the building | 100% re-test | BS 9999 |
01
The schedule by building type
02
When the fire risk assessment shortens the interval
The Responsible Person's Fire Risk Assessment can require more frequent testing than the BS 9999 baseline — for example in sleeping accommodation, in buildings with vulnerable occupants, or where dampers protect a single escape route. The FRA prevails over the standard.
03
Documentation the inspector will ask for
- Full damper register with location, type, manufacturer, install date
- Last drop test report with photo per damper
- Remedial works log for any failures
- Contractor competence evidence (BESA, training records, PI insurance)
- Next due-date schedule mapped against the building's planned maintenance system
04
Frequently asked questions
How often do fire dampers need to be inspected?
Annual drop testing is the BS 9999 baseline for most commercial UK buildings. Six-monthly is required for spring-operated dampers and dampers in critical estates such as hospitals (HTM 03-01), data centres and custodial buildings.
What does BS 9999 say about frequency?
BS 9999:2017 clause 32.5 requires testing at least annually, plus a functional test after any building work that could have disturbed the damper, and re-commissioning of all dampers after a fire event in the building.
Can we extend the interval if we've had clean tests?
No. The interval is a maximum, not a starting point. Insurance auditors and fire officers will request the previous 12-month record at every visit; a missing test invalidates the fire risk assessment.
Do smoke control dampers follow the same schedule?
Smoke control dampers in smoke ventilation systems are governed by BS 9991 / BS 7346-8 and are typically tested every 6 months as part of the smoke control system service.