A fire damper is primarily designed to maintain the fire resistance of a wall or floor by closing automatically in a fire and stopping flames and hot gases from spreading through ductwork. A smoke damper, sometimes called a smoke control damper, is primarily designed to control the movement of smoke as part of a smoke management system. The two functions are related but not identical, and they are based on different test and classification standards.

Understanding the difference is important when specifying protection for ventilation, process air and other ducted systems in buildings.

Function and purpose of a fire damper

The main function of a fire damper is to restore the fire resistance of a fire-rated barrier that has been penetrated by a duct or transport system. In normal conditions, the damper is open and allows air or process gas to pass. When a fire occurs and the damper is triggered, a closure element moves into position and blocks the opening.

Key points about fire dampers:

• they are tested for fire resistance, typically for integrity and insulation (E and I)
• they are installed in or near fire-rated walls and floors
• they contribute to maintaining fire compartmentation
• they are usually covered by EN 15650, EN 1366-2 and EN 13501-3 in Europe

Function and purpose of a smoke damper

A smoke damper is designed to control smoke rather than to provide a defined fire resistance rating for a wall or floor. Smoke control systems are intended to:

• keep escape routes and stairs free of smoke for as long as possible
• support fire-fighting operations
• limit smoke spread to other parts of the building

Smoke dampers may be used to open or close certain duct routes under smoke control, often in combination with fans and other components. They are typically tested and classified under different standards from fire dampers, reflecting their role in smoke leakage and control rather than purely fire resistance.

Different standards and applications

Because fire and smoke dampers have different functions, they are covered by different standards and requirements. For fire dampers, the key European standards are EN 15650, EN 1366-2 and EN 13501-3. Smoke control dampers are covered by other specific standards that focus on smoke leakage and smoke control performance.

In some building projects, both types of protection are needed:

• fire dampers to maintain the fire resistance of compartment boundaries
• smoke dampers as part of a smoke control or smoke extraction system

The fire strategy and building regulations for the project will determine which components are required and how they should be combined.

When do you need both fire and smoke protection?

In simple systems, it may be sufficient to install fire dampers at compartment boundaries to limit fire spread through ducts. In more complex buildings, especially those with large open spaces, underground car parks or long escape routes, a dedicated smoke control system may be required in addition to the passive fire protection.

In these cases, the designer may specify:

• fire dampers at compartment boundaries
• smoke control dampers in ducts serving smoke extraction or pressurisation systems
• appropriate detection, control and power supplies for the smoke control system

It is important not to assume that a fire damper automatically fulfils the role of a smoke damper, or vice versa, unless explicitly documented.

How FireSep fits into fire vs smoke damper applications

FireSep products are fire dampers intended to restore the fire resistance of walls and floors penetrated by air or pneumatic material transport systems. FireSep fire dampers are CE marked in accordance with CPR 305/2011/EU and manufactured in compliance with EN 15650. Fire resistance is documented through testing in accordance with EN 1366-2 and classification in accordance with EN 13501-3, based on tests carried out by DBI.

They are designed and documented for fire resistance; they are not dedicated smoke control dampers. In projects where specific smoke control functions are required, additional smoke control components may be needed alongside FireSep fire dampers, in line with the overall fire and smoke control strategy and applicable regulations. This ensures that both fire resistance and smoke management requirements are properly addressed in the final solution.