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TECHNICAL SELECTION GUIDE
Air, Fire and Smoke Damper Differences
An air damper regulates airflow or pressure during normal operation; a fire damper closes to maintain fire compartmentation; a smoke control damper opens or closes according to the designed smoke-extract or pressurisation scenario. They are not interchangeable by name alone.
Direct answer
An air damper regulates airflow or pressure during normal operation; a fire damper closes to maintain fire compartmentation; a smoke control damper opens or closes according to the designed smoke-extract or pressurisation scenario. They are not interchangeable by name alone.
Technical review: MDES Engineering Technical TeamUpdated: 2026-10-25
Air and volume-control dampers
Manual or motorised dampers balance, isolate or regulate constant and variable airflow in normal HVAC service. Unless it has the required fire or smoke-control certification, a standard air damper is not a life-safety damper.
Fire dampers
A fire damper closes where a duct crosses a fire compartment boundary to restrict flame and heat transfer. Wall/floor construction, installation orientation, fire-resistance classification, release device and approved installation detail must be checked together.
Smoke control dampers
These dampers open or close according to the smoke-extract or pressurisation scenario. Temperature class, leakage, cycling, actuator and fire-alarm control compatibility are selected to the project.
Information required for quotation
State damper type, clear duct size, wall or floor installation, fire class, smoke scenario, actuator supply, fail-safe position, end switches, leakage requirement and quantity.
Primary damper functions
| Damper | Primary function | Normal position |
|---|---|---|
| Air damper | Airflow/isolation control | Project dependent |
| Fire damper | Maintain compartmentation | Usually open; closes on heat/alarm |
| Smoke control damper | Smoke extract or pressurisation | Scenario dependent |
| Fire and smoke damper | Combined safety function | Certified scenario |
Key points
- Do not use a standard air damper as a fire damper.
- Check classification together with installation construction and orientation.
- Specify actuator and alarm scenario.
- Follow the approved installation detail.
Frequently asked technical questions
Is a motorised air damper a fire damper?
No. It requires the applicable fire testing and classification.
Are fire and smoke dampers the same?
No. Their functions and test criteria differ; combined products are separately classified.
Is damper size identical to duct size?
Clear opening, casing size and installation opening can differ; check manufacturer details.
Is actuator information required?
Yes. State supply voltage, spring return, fail-safe position and auxiliary contacts.
Technical references
- EN 15650 fire dampers
- EN 12101-8 smoke control dampers
- EN 1366-2 and EN 1366-10 fire tests
- EN 13501-3 and EN 13501-4 classification
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