# Damper: Building Code Definition

> How the IBC 2009, IRC 2009, IMC 2009 define damper, where the wording differs, and which chapters depend on the term.

- Canonical: https://harth.build/resources/glossary/damper/
- Last updated: 2026-09-07
- Data source: Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The [ICC code library](https://codes.iccsafe.org/codes) publishes the current model text and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) show which edition a jurisdiction has adopted; those sources control.

## Key facts

| Fact | Value |
| --- | --- |
| Defined in | IBC 2009, IRC 2009, IMC 2009 (2009 editions transcribed in this corpus) |
| Primary source | IBC 2009 Fire and Smoke Protection Features (model text, not a jurisdiction's adopted text) |
| Chapters using the term | 29 (counted across the codes hosted here) |
| Wording identical across codes | No (compare before citing one code's wording under another) |

## Direct answer

Damper is a defined term in the International Building Code (IBC) 2009, in Fire and Smoke Protection Features. The code's own words are: “See "Ceiling radiation damper," "Combination fire/smoke damper," "Fire damper" and "Smoke damper."” The IRC 2009, IMC 2009 define the same term with different wording, so the controlling text depends on which code governs the question in front of you — the comparison below sets the versions side by side. The term is used in 29 chapters of this corpus, most often in Duct Systems (IMC 2009), Fire and Smoke Protection Features (IBC 2009), Fire Protection Systems (IBC 2009). These pages transcribe the 2009 model text; verify the definition against the edition and amendments your authority having jurisdiction has adopted.

*Content and cited inputs reviewed by [Scott Barrington](https://nz.linkedin.com/in/barrington), Harth founder and architectural technology specialist · Published 2026-09-07 · Updated 2026-09-07.*

## What does this term mean?

**Damper** — IBC 2009, Fire and Smoke Protection Features:

> See "Ceiling radiation damper," "Combination fire/smoke damper," "Fire damper" and "Smoke damper."

![Labeled code-term definition diagram: Damper: Building Code Definition](https://efwwel0vyt9vy5so.public.blob.vercel-storage.com/images/glossary/damper/diagram-1344.webp)

*How the IBC 2009, IRC 2009, IMC 2009 define damper, where the wording differs, and which chapters depend on the term.*

## What must be verified before using this guidance?

Three of the I-Codes in this corpus define **Damper**, and the wording is not identical — read the version that governs your question.

| Code | Where it is defined | Definition |
| --- | --- | --- |
| IBC 2009 | [Fire and Smoke Protection Features](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/fire-and-smoke-protection-features.md) | See "Ceiling radiation damper," "Combination fire/smoke damper," "Fire damper" and "Smoke damper." |
| IRC 2009 | [Fuel Gas](https://harth.build/resources/building-codes/us-states/maryland/irc-2009/fuel-gas.md) | A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases. |
| IMC 2009 | [Definitions](https://harth.build/resources/building-codes/us-states/new-hampshire/imc-2009/definitions.md) | A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases. |

## Where damper is used in the code

The term appears in 29 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next.

| Chapter | Code | Mentions |
| --- | --- | --- |
| [Duct Systems](https://harth.build/resources/building-codes/us-states/new-hampshire/imc-2009/duct-systems.md) | IMC 2009 | 285 |
| [Fire and Smoke Protection Features](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/fire-and-smoke-protection-features.md) | IBC 2009 | 271 |
| [Fire Protection Systems](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/fire-protection-systems.md) | IBC 2009 | 40 |
| [Fire Protection Systems](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/fire-protection-systems.md) | IFC 2009 | 37 |
| [Commercial Energy Efficiency](https://harth.build/resources/building-codes/us-states/maryland/iecc-2009/commercial-energy-efficiency.md) | IECC 2009 | 36 |
| [Exhaust Systems](https://harth.build/resources/building-codes/us-states/new-hampshire/imc-2009/exhaust-systems.md) | IMC 2009 | 27 |
| [Fuel Gas](https://harth.build/resources/building-codes/us-states/maryland/irc-2009/fuel-gas.md) | IRC 2009 | 21 |
| [Definitions](https://harth.build/resources/building-codes/us-states/new-hampshire/imc-2009/definitions.md) | IMC 2009 | 11 |
| [Masonry](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/masonry.md) | IBC 2009 | 10 |
| [Chimneys and Fireplaces](https://harth.build/resources/building-codes/us-states/maryland/irc-2009/chimneys-and-fireplaces.md) | IRC 2009 | 8 |
| [Chimneys and Vents](https://harth.build/resources/building-codes/us-states/maryland/irc-2009/chimneys-and-vents.md) | IRC 2009 | 8 |
| [Residential Energy Efficiency](https://harth.build/resources/building-codes/us-states/maryland/iecc-2009/residential-energy-efficiency.md) | IECC 2009 | 7 |

_17 further chapters mention the term._

### The term in use

How the code actually writes about damper, quoted from the 2009 text hosted here:

> Each volume damper or other means of supply air adjustment used in balancing shall be provided with access.

— [IMC 2009 §603.17](https://harth.build/resources/building-codes/us-states/new-hampshire/imc-2009/duct-systems.md)

> Air transfer openings in smoke partitions shall be provided with a smoke damper complying with Section 716.3.2.2.

— [IBC 2009 §711.7](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/fire-and-smoke-protection-features.md)

> Auxiliary and supplementary components, such as switches, door and window releases, interconnected valves, damper releases and supplementary alarms, shall be manually operated at 12-month intervals to ensure that such components are in proper operating condition.

— [IFC 2009 §904.8.5](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/fire-protection-systems.md)


## The terms damper is built out of

The definition above leans on 5 other defined terms. Each carries its own code definition, and a local amendment to any of them changes what damper covers:

- **[Combination Fire/smoke Damper](https://harth.build/resources/glossary/combination-fire-smoke-damper.md)** — IBC 2009: A listed device installed in ducts and air transfer openings designed to close automatically upon the detection of heat and resist the passage of flame and smoke.
- **[Ceiling Radiation Damper](https://harth.build/resources/glossary/ceiling-radiation-damper.md)** — IBC 2009: A listeddevice installed in a ceiling membrane of a fire-resistance-rated floor/ceiling or roof/ceiling assembly to limit automatically the radiative heat transfer through an air inlet/outlet opening.
- **[Smoke Damper](https://harth.build/resources/glossary/smoke-damper.md)** — IBC 2009: A listed device installed in ducts and air transfer openings designed to resist the passage of smoke.
- **[Fire Damper](https://harth.build/resources/glossary/fire-damper.md)** — IBC 2009: A listed device installed in ducts and air transfer openings designed to close automatically upon detection of heat and resist the passage of flame.
- **[Combustion](https://harth.build/resources/glossary/combustion.md)** — IRC 2009: In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light.

## Damper: what to open, and in what order

Every row is a document this term depends on. The [ICC code library](https://codes.iccsafe.org/codes) and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) cover the middle rows.

| Check | Where | Confirmed |
| --- | --- | --- |
| Read the definition in the adopted IBC | Fire and Smoke Protection Features | |
| Read the definition in the adopted IRC | Fuel Gas | |
| Read the definition in the adopted IMC | Definitions | |
| Re-check the requirement that uses it | Duct Systems (IMC 2009) | |
| Re-check the requirement that uses it | Fire and Smoke Protection Features (IBC 2009) | |
| Re-check the requirement that uses it | Fire Protection Systems (IBC 2009) | |
| Re-check the requirement that uses it | Fire Protection Systems (IFC 2009) | |
| Confirm the dependent definition | Combination Fire/smoke Damper | |
| Confirm the dependent definition | Ceiling Radiation Damper | |
| Confirm the dependent definition | Smoke Damper | |
| Local amendment to any of the above | Jurisdiction's amendment list | |

**A research aid, not a code determination.** The authority having jurisdiction decides which edition and which amendments apply.

## Where can you explore related guidance?

- [Explore all glossary guidance](https://harth.build/resources/glossary.md)
- [Combination Fire/smoke Damper: Building Code Definition](https://harth.build/resources/glossary/combination-fire-smoke-damper.md)
- [Ceiling Radiation Damper: Building Code Definition](https://harth.build/resources/glossary/ceiling-radiation-damper.md)
- [Smoke Damper: Building Code Definition](https://harth.build/resources/glossary/smoke-damper.md)
- [Fire Damper: Building Code Definition](https://harth.build/resources/glossary/fire-damper.md)

## Sources and method

Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The [ICC code library](https://codes.iccsafe.org/codes) publishes the current model text and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) show which edition a jurisdiction has adopted; those sources control.

### Source links

- [codes.iccsafe.org](https://codes.iccsafe.org/codes)

- [iccsafe.org](https://www.iccsafe.org/advocacy/code-adoption-maps/)

## Frequently asked questions

### What is the code definition of damper?

The International Building Code (IBC) 2009 defines it in Fire and Smoke Protection Features as: “See "Ceiling radiation damper," "Combination fire/smoke damper," "Fire damper" and "Smoke damper."” The 2009 model text is reproduced here; the definition that binds your project is the one in the edition your jurisdiction has adopted, as amended locally.

### Do the I-Codes define damper the same way?

No. IBC 2009, IRC 2009, IMC 2009 all define the term, but the wording is not identical, and a difference in wording can change which requirements are triggered. The comparison table above sets the versions side by side so you can read the one that governs your question.

### Which parts of the code depend on damper?

In this corpus the term is used across 29 chapters, led by Duct Systems in the IMC 2009. Those are the sections whose scope moves if the definition is amended locally, so read them together with Chapter 2 rather than on their own.

### What is the definition of a damper in construction?

In the 2009 I-Codes hosted here it is a defined term rather than a description. The IBC 2009 states, in Fire and Smoke Protection Features: “See "Ceiling radiation damper," "Combination fire/smoke damper," "Fire damper" and "Smoke damper."” It is defined in IBC 2009, IRC 2009, IMC 2009. Because it is a defined term, whatever the adopted edition says it means is what every section using it means — so check Chapter 2 of that edition and any local amendment before relying on this wording.

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