Smoke ventilation is a life-safety system, not a comfort one. Its job is to keep escape routes usable and give the fire service somewhere to work, and it is judged on whether it performs on the worst day rather than on how it feels day to day. That difference runs through everything: the equipment, who may design it, and what has to be handed over at the end.
Send the building type, the floor area and the occupancy, and whether there is an existing fire or rational design.
Get Smoke Ventilation QuotesThis is not general aircon work. Part T of the National Building Regulations covers fire protection, and smoke control in most buildings of any size is a rational design prepared and signed off by a competent person. The installation follows that design; it does not replace it. Any contractor willing to price a smoke system off a floor plan alone is the wrong contractor.
The Main System Types
| System | What it does | Typically found in |
|---|---|---|
| Natural smoke vents and AOVs | Automatic opening vents in a roof or facade let smoke out by buoyancy | Warehouses, atria, stair cores, single-storey retail |
| Mechanical smoke extraction | High-temperature rated fans pull smoke out at a designed rate | Basements, enclosed parking, malls, deep floor plates |
| Stairwell and lobby pressurisation | Holds the escape route at a higher pressure so smoke cannot enter | High-rise offices and residential towers |
| Smoke curtains and reservoirs | Drop down to contain smoke in a defined zone rather than letting it spread | Atria, shopping centres, open-plan floors |
| Fire and smoke dampers | Close ducts at compartment boundaries so the ductwork does not carry fire | Any ducted building with fire compartments |
What Makes the Equipment Different
A smoke extract fan is not a big ventilation fan. It is certified to keep running in hot smoke for a defined period — commonly rated at 300°C or 400°C for two hours — and the certification covers the motor position, the mountings and the wiring as a system rather than the impeller alone. Substituting an ordinary fan of the same airflow is the most expensive shortcut available on this work, because it will fail the commissioning and it will fail the fire.
The same logic applies to the supporting parts: fire-rated cabling that survives long enough to matter, control panels with battery backup, dampers with certified actuators, and an interface to the fire detection system so the whole thing starts without anybody pressing anything.
Design, Commissioning and Sign-Off
- Rational design first. A competent person establishes the smoke zones, the extract rates, the make-up air and how the system is triggered. Everything downstream depends on it.
- Make-up air is half the system. Extraction with nowhere for replacement air to come from achieves very little. Inlet area is designed alongside the extract rate, not added afterwards.
- Interface with detection. The smoke system normally runs off the fire panel, with a defined cause-and-effect matrix: this detector triggers these fans, these dampers and these vents.
- Commissioning with documentation. Measured airflows, damper operation, fan run-up times, panel response, and a certificate. This is what an occupancy certificate and an insurer will ask for.
- Annual testing. Systems that sit idle for a year are the ones that do not start. Scheduled testing with a record is a requirement in practice as well as on paper.
Smoke Ventilation Prices in Pretoria
| Scope | Indicative range | Notes |
|---|---|---|
| Rational design by a competent person | R25,000 – R150,000 | Building size and complexity dependent |
| High-temperature smoke extract fan, installed | R45,000 – R180,000 | Per fan, rating and mounting dependent |
| Automatic opening vent (AOV) | R28,000 – R95,000 | Each, size and actuation dependent |
| Fire or smoke damper, supplied and installed | R3,500 – R12,000 | Each, size and access dependent |
| Smoke curtains and reservoir screens | R2,500 – R6,500 per m² | Fixed or automatic drop |
| Detection interface and control panel | R35,000 – R220,000 | Cause-and-effect matrix dependent |
| Stairwell pressurisation system | R180,000 – R850,000 | Building height and stair count dependent |
| Basement or enclosed parking extraction | R350,000 – R2,500,000 | Volume, zones and fire strategy dependent |
| Commissioning and certification | R15,000 – R85,000 | Measured results and documentation |
| Annual test and service | R8,500 – R45,000 | Per year, system size dependent |
Indicative Pretoria ranges, not a quotation. Smoke systems are priced off a design, not off a floor area, and the spread above is wide for that reason. Two buildings of identical size with different fire strategies can differ by an order of magnitude.
Send the building and the design status, and compare quotes from contractors who do this work.
Compare Local QuotesFrequently Asked Questions
Is smoke ventilation the same as normal extraction?
No. Comfort extraction moves air in normal conditions; smoke ventilation has to keep working in hot smoke, start automatically off the fire detection system, and survive long enough for people to get out. The fans, the cabling, the dampers and the controls are all certified for that duty, and an ordinary ventilation fan of the same airflow is not a substitute.
Do I need a rational design?
For most buildings of any size, yes. Part T of the National Building Regulations covers fire protection, and smoke control is normally addressed through a rational design prepared and signed off by a competent person. That design sets the extract rates, the zones and the triggering, and the installation is built to it. Get it done before you take installation quotes rather than after.
What does a F300 or F400 rating mean?
It is the fan’s certified high-temperature duty: broadly, continuing to operate in smoke at 300°C or 400°C for a defined period, commonly two hours. The rating applies to the fan as a tested assembly — motor position, mountings and terminations included — which is why the certification cannot be transferred to a similar-looking fan.
Why does make-up air matter so much?
Because you cannot extract air from a sealed box. If there is no designed inlet path, the extract fans pull against the building and move a fraction of their rated volume, which is exactly the failure that shows up at commissioning. Inlet area is designed alongside the extract rate and is not an afterthought.
How often does the system need testing?
Annually as a baseline, with records kept, and more often where an insurer or a local authority requires it. Smoke systems sit idle by design, and the two things that stop them working are seized dampers and control faults that nobody has exercised. A test with measured results is worth considerably more than a visual inspection.
Can our existing HVAC contractor do this work?
Sometimes, but it is worth confirming rather than assuming. The relevant questions are whether they work to a rational design, whether they can supply certified equipment with its documentation, and whether they can commission the system and issue a certificate with measured results. A contractor who is strong on comfort cooling is not automatically set up for any of that.
Smoke ventilation enquiries are matched through Aircon Installers Pretoria to contractors who work on fire and smoke control systems.
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