A high-rise residential project in Dubai Marina specifies more than 500 smoke exhaust fans, each rated 280°C for 2 hours and carrying CNEX explosion-proof protection, as part of the towers' life-safety ventilation strategy. The fans serve both daily and emergency duty across the development.
Smoke Strategy in High-Rise Residential Towers
A tall residential tower stacks many flats above a single base, so a fire on one floor must not fill the stair cores or corridors with smoke that traps residents above. The ventilation design uses pressurisation of escape stairs and extraction from lobbies and car parks, so smoke is held away from the routes people use to leave and the firefighters use to enter. The fans must keep running as the building heats during the event, which is the whole point of the rating.
A 280°C for 2-hour rating means the fan is proven to operate in hot smoke for the full duration, giving a long window for evacuation and response in a building where descent takes time and lifts may be out of service. In a marina development with enclosed car parks below residences, the same fans often serve the parking smoke extract, where vehicle fires are a real risk that a comfort fan cannot meet.
CNEX explosion-proof protection applies where the atmosphere could contain flammable vapour, such as a vehicle park, so the fan is built to avoid igniting it. Specifying both the high-temperature rating and the explosion protection in one package answers two hazards with a consistent, certified build, rather than bolting a protection package onto a fan that was not designed for it.
The strategy also assumes the fans start automatically on the fire signal and that the building's two regimes, daily ventilation and emergency extract, are coordinated by the control system rather than by a person, because in a tower nobody is walking the floors during an alarm.
Fan Package Parameters
The table lists the key figures for the tower package, the scale that tests batch consistency as much as product design.
| Item | Specification | Note |
|---|---|---|
| Quantity | 500+ fans | residential towers |
| Rating | 280°C for 2 hours | smoke extract |
| Protection | CNEX explosion-proof | car park hazard |
| Airflow | up to 50,000 m3/h | per large unit |
| Pressure | up to 1,200 Pa | shaft and duct |
Supplying more than 500 units to one programme demands batch consistency, because the fire strategy assumes every fan performs to its rated point whenever called, not just a few sampled at the factory, and a weak unit in one stair is a weak strategy for that stair.
The CNEX protection also means the car-park fans can run during a vehicle-fire smoke extract without becoming the ignition source, which is the precise hazard the protection exists to remove, and the reason it is specified rather than optional.
Selection Checklist
High-rise fire ventilation should be specified against these points, because a tower is unforgiving of a fan that misses its duty.
- Set the duration: confirm 1-hour or 2-hour rating from the fire strategy, not a default.
- Add protection where needed: use explosion-proof fans in car parks and plant.
- Separate the duties: define stair pressurisation versus lobby and park extract.
- Verify at source: factory test each fan or a tight sampling plan.
- Plan access: 500 units need a service and spare-impeller plan.
Why the Project Matters
In a dense marina skyline, life-safety ventilation is what lets a tower be occupied with confidence. A consistent, certified fan package across 500-plus units is the practical expression of that safety case, because the certificate on the submittal has to match the unit in the shaft.
For residents and regulators alike, verified smoke extract performance is the measure that turns a design drawing into a building people can live in safely, and the 2-hour rating gives the time that a high-rise evacuation genuinely needs.
The CNEX-rated car-park fans close the last gap, so the same development handles both a residential-floor fire and a basement vehicle fire with equipment built for each, not a general fan hoping to cope.
For a development of this size, the operator should also plan a regular test run of the smoke fans, because 500 units that have never turned since install are 500 unknowns on the day they are needed. A scheduled functional test, logged per fan, catches a seized bearing or a stuck blade before an incident rather than during one, and it confirms the control still starts the right fan on the right signal. The CNEX-rated car-park fans in particular should be exercised, since vehicle-fire extract is the duty nobody wants to discover unproven. A marina tower's safety case is only as strong as its last test, and the discipline of testing at scale is what makes the certified package real across all the stairs and lobbies it protects.
Keruite engineers respond to selection enquiries within 24 hours, backed by the factory's own performance testing laboratory and more than 30 years of fan manufacturing experience.